[CI] hx-yaml is not needed

.travis.yml

@@ -42,7 +42,6 @@ script:
   - sudo make install -s
   - cd tests/
   - mkdir ~/haxelib && haxelib setup ~/haxelib
-  - haxelib git hx-yaml https://github.com/mikestead/hx-yaml master src
   - haxe -version
   - haxe RunCi.hxml
   - neko RunCi.n

appveyor.yml

@@ -51,7 +51,6 @@ build_script:
     - cd %APPVEYOR_BUILD_FOLDER%/tests/
     - mkdir "%HAXELIB_ROOT%"
     - haxelib setup "%HAXELIB_ROOT%"
-    - haxelib git hx-yaml https://github.com/mikestead/hx-yaml master src
 
 test_script:
     - cd %APPVEYOR_BUILD_FOLDER%/tests/