Adjust .travis.yml generation process to prevent trailing new line

.travis.yml

@@ -72,6 +72,7 @@ jobs:
         secure: "HkgYgawkr/hkg2vURHGOb/JmF6U1e71QQsd0HXJ1UJh6WBiFJOrjomCMHZGHnpyopdRna++up8dISBqM2X+EiLAr9yWdRXy72oMP9X42M0ccnja/3E5KYYXMkETS50JnUhMCOt2xRZW5/ojqrHukqRo0YIjIu+P0U0VsZ4QIsng="
 
     # Docker Build #
+
     - stage: Build
       env:
         - NODE_VERSION: "10"

update.sh

@@ -77,11 +77,11 @@ function add_stage() {
   local variant=$1
   shift
 
-  echo '    - stage: Build
+  echo '
+    - stage: Build
       env:
         - NODE_VERSION: "'"$version"'"
-        - VARIANT: "'"$variant"'"
-' >>.travis.yml
+        - VARIANT: "'"$variant"'"' >>.travis.yml
 }
 
 echo '#### DO NOT MODIFY. THIS FILE IS AUTOGENERATED ####