Remove dmd 2.071.2 support

.travis.yml

@@ -11,7 +11,6 @@ d:
   - dmd-2.074.1
   - dmd-2.073.2
   - dmd-2.072.2
-  - dmd-2.071.2
 
 env: 
   matrix:

README.md

@@ -143,7 +143,6 @@ There are more containers in the `tanya.container` package.
 | 2.074.1 |
 | 2.073.2 |
 | 2.072.2 |
-| 2.071.2 |
 
 ### Current status
 

appveyor.yml

@@ -27,12 +27,6 @@ environment:
     - DC: dmd
       DVersion: 2.072.2
       arch: x86
-    - DC: dmd
-      DVersion: 2.071.2
-      arch: x64
-    - DC: dmd
-      DVersion: 2.071.2
-      arch: x86
 
 skip_tags: true
 
@@ -49,12 +43,6 @@ install:
         }
   - ps: SetUpDCompiler
 
-  - ps: if($env:DVersion -eq "2.071.2"){
-          Invoke-WebRequest "http://code.dlang.org/files/dub-1.2.1-windows-x86.zip" -OutFile "dub.zip";
-          7z x dub.zip -odub > $null;
-          Move-Item "dub/dub.exe" "C:\dmd2\windows\bin"
-        }
-
 before_build:
   - ps: if($env:arch -eq "x86"){
           $env:compilersetupargs = "x86";