build: update typescript to version ~2.7.1 (#68)

Author: renovate[bot]

package.json

@@ -42,6 +42,6 @@
     "protractor": "~5.3.0",
     "ts-node": "~4.1.0",
     "tslint": "~5.9.0",
-    "typescript": "~2.6.1"
+    "typescript": "~2.7.1"
   }
 }

yarn.lock

@@ -6395,6 +6395,10 @@ typescript@~2.6.1:
   version "2.6.2"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.6.2.tgz#3c5b6fd7f6de0914269027f03c0946758f7673a4"
 
+typescript@~2.7.1:
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.7.1.tgz#bb3682c2c791ac90e7c6210b26478a8da085c359"
+
 uglify-es@^3.2.0:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/uglify-es/-/uglify-es-3.2.1.tgz#93de0aad8a1bb629c8a316f686351bc4d6ece687"