build: upgrade typescript

package.json

@@ -137,7 +137,7 @@
     "selenium-server": "^2.53.1",
     "serialize-javascript": "^1.3.0",
     "shelljs": "^0.8.1",
-    "typescript": "^2.7.1",
+    "typescript": "^3.1.3",
     "uglify-js": "^3.0.15",
     "webpack": "^4.22.0",
     "weex-js-runtime": "^0.23.6",

yarn.lock

@@ -8110,10 +8110,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^2.7.1:
-  version "2.9.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.2.tgz#1cbf61d05d6b96269244eb6a3bce4bd914e0f00c"
-  integrity sha512-Gr4p6nFNaoufRIY4NMdpQRNmgxVIGMs4Fcu/ujdYk3nAZqk7supzBE9idmvfZIlH/Cuj//dvi+019qEue9lV0w==
+typescript@^3.1.3:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.3.tgz#01b70247a6d3c2467f70c45795ef5ea18ce191d5"
+  integrity sha512-+81MUSyX+BaSo+u2RbozuQk/UWx6hfG0a5gHu4ANEM4sU96XbuIyAB+rWBW1u70c6a5QuZfuYICn3s2UjuHUpA==
 
 uglify-es@^3.3.4:
   version "3.3.9"