Bump ts-loader from 4.5.0 to 5.2.1

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 4.5.0 to 5.2.1.
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md)
- [Commits](TypeStrong/ts-loader@v4.5.0...v5.2.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

package-lock.json

@@ -27,7 +27,7 @@
     "prettier": "1.14.2",
     "source-map-loader": "^0.2.4",
     "tape": "^4.9.1",
-    "ts-loader": "^4.5.0",
+    "ts-loader": "^5.2.1",
     "typescript": "^3.0.3",
     "webpack": "^4.17.1",
     "webpack-cli": "^3.1.2",