Bump underscore and grunt-ts

[dependabot[bot]]

Removes underscore. It's no longer used after updating ancestor dependency grunt-ts. These dependencies need to be updated together.

Removes underscore

Updates grunt-ts from 5.5.1 to 6.0.0-beta.22

Changelog

Sourced from grunt-ts's changelog.

v6.0.0-beta.22

• FIX: Loosen Grunt peer dependency to any 1.0 version. Thanks for the PR @​danielrentz. (#431)

v6.0.0-beta.21

• FIX: Resolves baseUrl appearing blank under certain circumstances. Thanks for the PR to first-time contributor @​beyerleinf. (#426)

v6.0.0-beta.20

• FEATURE: Adds support for a RegEx to exclude files from the fast cache. Thanks for the PR to first-time contributor @​shuky19. (#422)

v6.0.0-beta.19

• FIX: using out in conjunction with a tsconfig.json was broken. Thanks for the report @​jkanchelov. (#409)

v6.0.0-beta.18

• FEAT: Adds support for compiler features up to TypeScript 2.7 (esModuleInterop, strictPropertyInitialization, esnext module type).
• DOCS: Recommend using tsconfig.json over GruntJS-style src setup.

v6.0.0-beta.17

• FEAT: Adds support for compiler features up to TypeScript 2.6 RC (strictFunctionChecks).
• FIX: Whoops I didn't realize skipLibCheck and skipDefaultLibCheck were different. Fixed in this release - thanks @​kierans (#413).
• FEAT: Somewhat tighter npm package due to improved .npmignore file. Thanks to first time contributor, @​stevegreatrex (#287) (#411).
• FEAT: New support for specifying location of the tscache directory. See docs for tsCacheDir for more details. Thanks very much to first time contributor @​beebs93 (#414) (#415).

v6.0.0-beta.16

• FIX: Now accepts more watchable file extensions. Thanks for the PR, first time contributor, @​LibanHassan (#404) Issue not found? Not after Liban fixed it, anyway :-)
• FIX: When using baseDir task option, will no longer include .baseDir.ts file in the compilation context. Thanks for the PR, first time contributor @​nobuoka (#380). Sorry it took so long to review this PR!!!
• FIX: When using rootDir with outDir, will no longer create a .baseDir.ts file. (Requires TypeScript 1.5 or higher).
• FIX: When using outDir without rootDir, will issue a warning. (If using TypeScript 1.5 or higher).
• DOCS: Indicated that baseDir is now deprecated. Use rootDir instead, and upgrade to TypeScript 1.5 or higher already, geez... ;-)
• FEAT: Now respects existing tsconfig.json line endings and indentation when updating. Thanks for the PR, first time contributor, RyanThomas73

v6.0.0-beta.15

• TODO: Update getting started documentation for TypeScript 2.0+ and npm 3+.
• FIX: Made typeRoots relative to the tsconfig.json file. Thanks for the report and PR, @​beuted (#399)
• FIX: Fixed "Must have TypeScript 1.8+" warning when using outFile and a custom compiler. Thanks for the report, @​blendsdk (#395)
• FEAT: Full support for TypeScript 2.2 including "extends" in tsconfig.json.
• FIX: Now minifies tsconfig.json content prior to parsing, so will no longer fail in the presence of comments.
• FIX: Now still honors Gruntfile.js exclude globs when using tsconfig. Thank you for the report and assistance with troubleshooting, @​metamaker (#394 and #392)

v6.0.0-beta.3

• CHORE: Update definition files used inside grunt-ts. Thanks @​vvakame!
• CHORE: Move typescript to a peer dependency.
• FIX: Loosened warnings on bad config that isn't actually bad config. Thanks for the report, @​0815fox (#364)!
• FEAT: Support added for testing Node 4, 5, and 6 in the Travis.yml. Also upgraded Chokidar to 1.6 - thanks for the PR, @​franleplant (#370)
• FIX: Added "none" as valid option for module setting. Thanks for the PR, @​kodypeterson (#371)
• DOCS: Fixed up docs for module setting - thanks for the PR, @​zzsanduo (#362)

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