Bumps [ktlint](https://github.com/shyiko/ktlint) from 0.30.0 to 0.31.0.
<details>
<summary>Release notes</summary>
*Sourced from [ktlint's releases](https://github.com/shyiko/ktlint/releases).*
> ## 0.31.0
> ### Added
> - `dot-spacing` rule ([#293](https://github-redirect.dependabot.com/shyiko/ktlint/issues/293)).
> - `experimental/indent` rule ([#338](https://github-redirect.dependabot.com/shyiko/ktlint/issues/338)).
> Use `ktlint --experimental` to enable.
>
> ### Fixed
> - Spacing check around `<` & `>` operators.
>
> ### Changed
> - `no-multi-spaces` rule (horizontal alignment of comments is no longer allowed) ([#269](https://github-redirect.dependabot.com/shyiko/ktlint/issues/269)).
> - `colon-spacing` rule (`:` must not appear at the beginning of the line).
> - `package-name` rule (disabled until [#208](https://github-redirect.dependabot.com/shyiko/ktlint/issues/208) is resolved).
> - `--print-ast` to output [com.github.shyiko.ktlint.core.ast.ElementType.*](https://github.com/shyiko/ktlint/blob/master/ktlint-core/src/main/kotlin/com/github/shyiko/ktlint/core/ast/ElementType.kt) as `node.elementType`, e.g.
> ```
> $ echo 'fun f() {}' | ./ktlint/target/ktlint --print-ast --color --stdin
> 1: ~.psi.KtFile (FILE)
> 1: ~.psi.KtPackageDirective (PACKAGE_DIRECTIVE) ""
> 1: ~.psi.KtImportList (IMPORT_LIST) ""
> 1: ~.psi.KtScript (SCRIPT)
> 1: ~.psi.KtBlockExpression (BLOCK)
> 1: ~.psi.KtNamedFunction (FUN)
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (FUN_KEYWORD) "fun"
> 1: ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) " "
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (IDENTIFIER) "f"
> 1: ~.psi.KtParameterList (VALUE_PARAMETER_LIST)
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (LPAR) "("
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (RPAR) ")"
> 1: ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) " "
> 1: ~.psi.KtBlockExpression (BLOCK)
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (LBRACE) "{"
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (RBRACE) "}"
> 1: ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) "\n"
>
> format: <line_number:> <node.psi::class> (<node.elementType>) "<node.text>"
> legend: ~ = org.jetbrains.kotlin, c.i.p = com.intellij.psi
> ```
>
> - `kotlin-compiler` version to 1.3.21 (from 1.3.20).
>
> ### Removed
> - Dependency on JCenter ([#349](https://github-redirect.dependabot.com/shyiko/ktlint/issues/349)).
</details>
<details>
<summary>Changelog</summary>
*Sourced from [ktlint's changelog](https://github.com/shyiko/ktlint/blob/master/CHANGELOG.md).*
> ## [0.31.0] - 2019-03-10
>
> ### Added
> - `dot-spacing` rule ([#293](https://github-redirect.dependabot.com/shyiko/ktlint/issues/293)).
> - `experimental/indent` rule ([#338](https://github-redirect.dependabot.com/shyiko/ktlint/issues/338)).
> Use `ktlint --experimental` to enable.
>
> ### Fixed
> - Spacing check around `<` & `>` operators.
>
> ### Changed
> - `no-multi-spaces` rule (horizontal alignment of comments is no longer allowed) ([#269](https://github-redirect.dependabot.com/shyiko/ktlint/issues/269)).
> - `colon-spacing` rule (`:` must not appear at the beginning of the line).
> - `package-name` rule (disabled until [#208](https://github-redirect.dependabot.com/shyiko/ktlint/issues/208) is resolved).
> - `--print-ast` to output [com.github.shyiko.ktlint.core.ast.ElementType.*](https://github.com/shyiko/ktlint/blob/master/ktlint-core/src/main/kotlin/com/github/shyiko/ktlint/core/ast/ElementType.kt) as `node.elementType`, e.g.
> ```
> $ echo 'fun f() {}' | ./ktlint/target/ktlint --print-ast --color --stdin
> 1: ~.psi.KtFile (FILE)
> 1: ~.psi.KtPackageDirective (PACKAGE_DIRECTIVE) ""
> 1: ~.psi.KtImportList (IMPORT_LIST) ""
> 1: ~.psi.KtScript (SCRIPT)
> 1: ~.psi.KtBlockExpression (BLOCK)
> 1: ~.psi.KtNamedFunction (FUN)
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (FUN_KEYWORD) "fun"
> 1: ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) " "
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (IDENTIFIER) "f"
> 1: ~.psi.KtParameterList (VALUE_PARAMETER_LIST)
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (LPAR) "("
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (RPAR) ")"
> 1: ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) " "
> 1: ~.psi.KtBlockExpression (BLOCK)
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (LBRACE) "{"
> 1: ~.c.i.p.impl.source.tree.LeafPsiElement (RBRACE) "}"
> 1: ~.c.i.p.impl.source.tree.PsiWhiteSpaceImpl (WHITE_SPACE) "\n"
>
> format: <line_number:> <node.psi::class> (<node.elementType>) "<node.text>"
> legend: ~ = org.jetbrains.kotlin, c.i.p = com.intellij.psi
> ```
>
> - `kotlin-compiler` version to 1.3.21 (from 1.3.20).
>
> ### Removed
> - Dependency on JCenter ([#349](https://github-redirect.dependabot.com/shyiko/ktlint/issues/349)).
</details>
<details>
<summary>Commits</summary>
- [`fb31f9f`](fb31f9f497) Updated refs to latest (0.31.0) release
- [`e8cdf60`](e8cdf60a7b) Bumped ktlint to 0.31.0 (ktlint-ruleset-template)
- [`abc2880`](abc2880637) Added 0.31.0 release notes
- [`a606d80`](a606d80377) Removed isPartOfRawMultiLineString from core.ast
- [`fcc2ff7`](fcc2ff7aff) Forced open quotes (of multi-line raw string) to be a separate line
- [`cdf93a9`](cdf93a9943) Fixed indentation of EQ COMMENT LF BLOCK
- [`8def3c8`](8def3c8531) Fixed : indentation when put on a separate line
- [`fe2f5ee`](fe2f5eec60) Changed colon-spacing rule to remove newline between colon and prev element
- [`8e4d16e`](8e4d16eca7) Fixed spacing check around <,> op
- [`b91ae6c`](b91ae6c4a3) Enabled --experimental ruleset as part of Maven verify phase
- Additional commits viewable in [compare view](https://github.com/shyiko/ktlint/compare/0.30.0...0.31.0)
</details>
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