Update grunt

.distignore

@@ -9,4 +9,5 @@ phpcs.xml
 node_modules
 logs
 package.json
-npm-debug.log
+npm-debug.log
+bin

.travis.yml

@@ -2,20 +2,21 @@ language: php
 
 ##  PHP versions to test  against
 php:
+    - "7.1"
     - "7.0"
     - "5.6"
     - "5.5"
     - "5.4"
     - "5.3"
-    - "5.2"
+
 matrix:
   include:
   - php: "7.0"
     before_install: chmod +x bin/wraith.sh
     install: true
     before_script:
     env: TEST_SUITE=Wraith_Visual_Regression_Testing WRAITH_FAIL=5
-    script: ./bin/wraith.sh    
+    script: ./bin/wraith.sh
 sudo: false
 env:
     - WP_VERSION=master WP_MULTISITE=0
@@ -50,4 +51,4 @@ before_script:
     - cd $theme_dir
 
 script:
-     grunt travis
+     grunt travis