build: update devDeps (#59)

* build: update devDeps and package-lock.json
* build: add TypeScript 3.2/3.3 to, remove 3.0 from CI environment
* build: add Node v11 to CI environment

Author: teppeis

.travis.yml

@@ -3,12 +3,13 @@ node_js:
   - "6"
   - "8"
   - "10"
+  - "11"
 sudo: false
 script:
   - npm test
-  - npm install -D typescript@3.0
+  - npm install -D typescript@3.2
   - npm test
-  - npm install -D typescript@2.9
+  - npm install -D typescript@3.1
   - npm test
   - npm install -D [email protected]
   - npm test