Update appveyor config

Author: acoburn

appveyor.yml

@@ -15,14 +15,14 @@ install:
     - echo extension_dir=ext >> php.ini
     - echo extension=php_openssl.dll >> php.ini
     - SET PATH=C:\tools\php71;%PATH%
-	- cd c:\projects\static-ldp
+    - cd c:\projects\static-ldp
     - php -r "readfile('http://getcomposer.org/installer');" | php
     - php composer.phar install --prefer-source --no-interaction
 
 build_script:
-	- cd c:\projects\static-ldp
+    - cd c:\projects\static-ldp
     - php composer.phar install
 
 test_script:
-	- cd c:\projects\static-ldp
+    - cd c:\projects\static-ldp
     - php composer.phar test