Update templates/flutter/.travis.yml.twig

Co-authored-by: Jake Barnby <[email protected]>

Author: lohanidamodar

templates/flutter/.travis.yml.twig

@@ -7,8 +7,8 @@ os: linux
 install:
 - cd ~
 - git clone https://github.com/flutter/flutter.git -b stable --depth 1
-- export PATH="$PATH:$pwd()/flutter/bin/cache/dart-sdk/bin"
-- export PATH="$PATH:$pwd()/flutter/bin"
+- export PATH="$PATH:$(pwd)/flutter/bin/cache/dart-sdk/bin"
+- export PATH="$PATH:$(pwd)/flutter/bin"
 - flutter doctor
 - mkdir -p  ~/.config/dart
 - |