Bump ts-loader from 4.5.0 to 6.0.1 (grpc#444)

* Bump ts-loader from 4.5.0 to 6.0.1

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 4.5.0 to 6.0.1.
- [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...v6.0.1)

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

* Fix out declaration output path

client/grpc-web-react-example/package.json

@@ -20,7 +20,7 @@
   "devDependencies": {
     "@types/google-protobuf": "^3.2.5",
     "concurrently": "^4.1.0",
-    "ts-loader": "^4.5.0",
+    "ts-loader": "^6.0.1",
     "ts-protoc-gen": "0.9.0",
     "typescript": "3.4.5",
     "webpack": "^4.17.2",

client/grpc-web/package.json

@@ -39,7 +39,7 @@
     "@types/google-protobuf": "^3.2.5",
     "@types/node": "^7.0.5",
     "google-protobuf": "^3.2.0",
-    "ts-loader": "^4.5.0",
+    "ts-loader": "^6.0.1",
     "typescript": "3.4.5",
     "webpack": "^4.29.3",
     "webpack-cli": "^3.2.3"

client/grpc-web/tsconfig.json

@@ -3,7 +3,7 @@
     "alwaysStrict": true,
     "sourceMap": true,
     "declaration": true,
-    "declarationDir": "typings",
+    "declarationDir": "./dist/typings",
     "target": "es5",
     "removeComments": true,
     "noImplicitReturns": true,
@@ -13,7 +13,7 @@
     "strictNullChecks": true,
     "stripInternal": true,
     "noFallthroughCasesInSwitch": true,
-    "outDir": "build",
+    "outDir": "dist",
     "noEmitOnError": true
   },
   "types": [