Remove Server 2008 from CI

shippable.yml

@@ -28,50 +28,36 @@ matrix:
     - env: T=units/3.7/2
     - env: T=units/3.8/2
 
-    - env: T=windows/2008/1
-    - env: T=windows/2008-R2/1
     - env: T=windows/2012/1
     - env: T=windows/2012-R2/1
     - env: T=windows/2016/1
     - env: T=windows/2019/1
 
-    - env: T=windows/2008/2
-    - env: T=windows/2008-R2/2
     - env: T=windows/2012/2
     - env: T=windows/2012-R2/2
     - env: T=windows/2016/2
     - env: T=windows/2019/2
 
-    - env: T=windows/2008/3
-    - env: T=windows/2008-R2/3
     - env: T=windows/2012/3
     - env: T=windows/2012-R2/3
     - env: T=windows/2016/3
     - env: T=windows/2019/3
 
-    - env: T=windows/2008/4
-    - env: T=windows/2008-R2/4
     - env: T=windows/2012/4
     - env: T=windows/2012-R2/4
     - env: T=windows/2016/4
     - env: T=windows/2019/4
 
-    - env: T=windows/2008/5
-    - env: T=windows/2008-R2/5
     - env: T=windows/2012/5
     - env: T=windows/2012-R2/5
     - env: T=windows/2016/5
     - env: T=windows/2019/5
 
-    - env: T=windows/2008/6
-    - env: T=windows/2008-R2/6
     - env: T=windows/2012/6
     - env: T=windows/2012-R2/6
     - env: T=windows/2016/6
     - env: T=windows/2019/6
 
-    - env: T=windows/2008/7
-    - env: T=windows/2008-R2/7
     - env: T=windows/2012/7
     - env: T=windows/2012-R2/7
     - env: T=windows/2016/7