Trying to fix appveyor script

.appveyor.yml

@@ -2,7 +2,7 @@ clone_folder: c:\dev\glm-cmake
 
 matrix:
   os: Visual Studio 2013
-    platform: x86
+    - platform: x86
       configuration: Release
       build_script:
       - md build32_pure_98_release
@@ -10,8 +10,7 @@ matrix:
       - cmake -DCMAKE_CXX_COMPILER=$COMPILER -DGLM_TEST_ENABLE=ON -DGLM_TEST_ENABLE_CXX_98=ON -DGLM_TEST_FORCE_PURE=ON ..
       - cmake -E time cmake --build . --config Release
 
-  os: Visual Studio 2013
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_pure_98_release
@@ -19,8 +18,7 @@ matrix:
       - cmake -DCMAKE_CXX_COMPILER=$COMPILER -DGLM_TEST_ENABLE=ON -DGLM_TEST_ENABLE_CXX_98=ON -DGLM_TEST_FORCE_PURE=ON ..
       - cmake -E time cmake --build . --config Release
 
-  os: Visual Studio 2013
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_pure_ms_release
@@ -29,7 +27,7 @@ matrix:
       - cmake -E time cmake --build . --config Release
 
   os: Visual Studio 2015
-    platform: x64
+    - platform: x64
       configuration: Debug
       build_script:
       - md build_pure_11_debug
@@ -37,8 +35,7 @@ matrix:
       - cmake -DCMAKE_CXX_COMPILER=$COMPILER -DGLM_TEST_ENABLE=ON -DGLM_TEST_ENABLE_CXX_11=ON -DGLM_TEST_FORCE_PURE=ON ..
       - cmake -E time cmake --build . --config Debug
 
-  os: Visual Studio 2015
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_pure_11_release
@@ -46,8 +43,7 @@ matrix:
       - cmake -DCMAKE_CXX_COMPILER=$COMPILER -DGLM_TEST_ENABLE=ON -DGLM_TEST_ENABLE_CXX_11=ON -DGLM_TEST_FORCE_PURE=ON ..
       - cmake -E time cmake --build . --config Release
 
-  os: Visual Studio 2015
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_sse3_11_release
@@ -56,7 +52,7 @@ matrix:
       - cmake -E time cmake --build . --config Release
 
   os: Visual Studio 2017
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_pure_14_release
@@ -64,8 +60,7 @@ matrix:
       - cmake -DCMAKE_CXX_COMPILER=$COMPILER -DGLM_TEST_ENABLE=ON -DGLM_TEST_ENABLE_CXX_14=ON -DGLM_TEST_FORCE_PURE=ON ..
       - cmake -E time cmake --build . --config Release
 
-  os: Visual Studio 2017
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_sse3_14_release
@@ -74,7 +69,7 @@ matrix:
       - cmake -E time cmake --build . --config Release
 
   os: Visual Studio 2017
-    platform: x64
+    - platform: x64
       configuration: Release
       build_script:
       - md build64_avx_14_release