build: update deps (#57)

* fix: npm upgrade
* build: update typescript to v3 in devDeps
* build: update eslint-config-teppeis

Author: teppeis

.travis.yml

@@ -5,12 +5,11 @@ node_js:
   - "10"
 sudo: false
 script:
-  - npm install -D [email protected]
-  - npm test
-  - npm install -D [email protected]
   - npm test
   - npm install -D [email protected]
   - npm test
+  - npm install -D [email protected]
+  - npm test
 cache:
   directories:
     - $HOME/.npm