Add Node.js 12 to CI Services (#724)

and remove trailing whitespace from .travis.yml

Co-authored-by: エリス <erisu@users.noreply.github.com>
Co-authored-by: Christopher J. Brody <brodybits@users.noreply.github.com>

.travis.yml

@@ -14,6 +14,7 @@ env:
     - nodejs_version=6
     - nodejs_version=8
     - nodejs_version=10
+    - nodejs_version=12
 
 language: android
 jdk:

appveyor.yml

@@ -11,6 +11,7 @@ environment:
         - nodejs_version: 6
         - nodejs_version: 8
         - nodejs_version: 10
+        - nodejs_version: 12
 
 install:
     # Install Android SDK Tools