ci: move travis from 13 to 14 (#707)

Co-authored-by: Gabriel Schulhof <[email protected]>

Author: gabrielschulhof

.travis.yml

@@ -14,7 +14,7 @@ env:
   matrix:
     - NODEJS_VERSION=node/10
     - NODEJS_VERSION=node/12
-    - NODEJS_VERSION=node/13
+    - NODEJS_VERSION=node/14
     - NODEJS_VERSION=nightly
 matrix:
   fast_finish: true