chore: update typescript to version ~2.6.1

Author: renovate[bot]

package.json

@@ -47,6 +47,6 @@
     "protractor": "~5.2.0",
     "ts-node": "~3.3.0",
     "tslint": "~5.8.0",
-    "typescript": "~2.5.0"
+    "typescript": "~2.6.1"
   }
 }

yarn.lock

@@ -5571,10 +5571,14 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-typescript@^2.3.3, typescript@~2.5.0:
+typescript@^2.3.3:
   version "2.5.3"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.5.3.tgz#df3dcdc38f3beb800d4bc322646b04a3f6ca7f0d"
 
+typescript@~2.6.1:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.6.1.tgz#ef39cdea27abac0b500242d6726ab90e0c846631"
+
 uglify-es@^3.1.3:
   version "3.1.6"
   resolved "https://registry.yarnpkg.com/uglify-es/-/uglify-es-3.1.6.tgz#b0f818c055a7e9538abc2286e70c743f2938311f"