Fixed tabs in yml

.travis.yml

@@ -56,14 +56,14 @@ script:
     if (php --version | grep -i HipHop > /dev/null); then
       echo "skipping application tests on HHVM"
     else
-	  cd apps/basic/web && php -S localhost:8080 > /dev/null 2>&1 &
-	  PHPPID=$!
+      cd apps/basic/web && php -S localhost:8080 > /dev/null 2>&1 &
+      PHPPID=$!
       cd ../tests && codecept run
-	  kill -9 $PHPPID
+      kill -9 $PHPPID
       cd ../../advanced && php -S localhost:8080 > /dev/null 2>&1 &
-	  PHPPID=$!
-	  cd tests && codecept run
-	  kill -9 $PHPPID
+      PHPPID=$!
+      cd tests && codecept run
+      kill -9 $PHPPID
     fi
 
 after_script: