fix(deps): update dependency typescript to v~2.6.1

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
     "release": "standard-version"
   },
   "dependencies": {
-    "typescript": "~2.4.1"
+    "typescript": "~2.6.1"
   },
   "devDependencies": {
     "@types/dedent": "0.7.0",

yarn.lock

@@ -3040,9 +3040,9 @@ typescript@2.4.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.4.1.tgz#c3ccb16ddaa0b2314de031e7e6fee89e5ba346bc"
 
-typescript@~2.4.1:
-  version "2.4.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.4.2.tgz#f8395f85d459276067c988aa41837a8f82870844"
+typescript@~2.6.1:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.6.1.tgz#ef39cdea27abac0b500242d6726ab90e0c846631"
 
 uglify-js@^2.6:
   version "2.8.29"