Update dmd to 2.081.1. Remove 2.077.1

.travis.yml

@@ -11,7 +11,6 @@ d:
   - dmd-2.080.1
   - dmd-2.079.1
   - dmd-2.078.3
-  - dmd-2.077.1
 
 env:
   matrix:

README.md

@@ -174,11 +174,10 @@ parameter is used)
 
 | DMD     | GCC       |
 |:-------:|:---------:|
-| 2.081.0 | *master*  |
+| 2.081.1 | *master*  |
 | 2.080.1 |           |
 | 2.079.1 |           |
 | 2.078.3 |           |
-| 2.077.1 |           |
 
 ### Release management
 

appveyor.yml

@@ -4,10 +4,10 @@ os: Visual Studio 2015
 environment:
   matrix:
     - DC: dmd
-      DVersion: 2.081.0
+      DVersion: 2.081.1
       arch: x64
     - DC: dmd
-      DVersion: 2.081.0
+      DVersion: 2.081.1
       arch: x86
     - DC: dmd
       DVersion: 2.080.1
@@ -27,12 +27,6 @@ environment:
     - DC: dmd
       DVersion: 2.078.3
       arch: x86
-    - DC: dmd
-      DVersion: 2.077.1
-      arch: x64
-    - DC: dmd
-      DVersion: 2.077.1
-      arch: x86
 
 skip_tags: true