Needs to be spaces and not tabs

appveyor.yml

@@ -1,20 +1,20 @@
 version: "{build}"
 
 platform:
-	- Win32
-	- x64
+    - Win32
+    - x64
 
 matrix:
-	fast_finish: true
+    fast_finish: true
 
 init:
-	- cmd: cmake --version
-	- cmd: msbuild /version
+    - cmd: cmake --version
+    - cmd: msbuild /version
 
 clone_folder: C:\projects\openmw
 
 build:
-	- cmd: sh C:\projects\openmw\CI\build.msvc.sh %platform%
+    - cmd: sh C:\projects\openmw\CI\build.msvc.sh %platform%
 
 before_build:
-	- cmd: sh C:\projects\openmw\CI\before_script.msvc.sh %platform%
+    - cmd: sh C:\projects\openmw\CI\before_script.msvc.sh %platform%