Improved Travis and AppVeyor configuration

Author: kukulich

.travis.yml

@@ -9,10 +9,13 @@ matrix:
       env: dependencies=lowest
     - php: 7.1
       env: dependencies=highest
+cache:
+  directories:
+    - $HOME/.composer/cache
 before_script:
   - composer self-update
-  - if [ "$dependencies" = "lowest" ]; then composer update --prefer-lowest -n; fi;
-  - if [ "$dependencies" = "highest" ]; then composer update -n; fi;
+  - if [ "$dependencies" = "lowest" ]; then composer update --prefer-lowest --prefer-dist --no-interaction --no-progress; fi;
+  - if [ "$dependencies" = "highest" ]; then composer update --prefer-dist --no-interaction --no-progress; fi;
 script:
   - bin/phing
 after_script:

appveyor.yml

@@ -56,8 +56,8 @@ install:
 
   # Install dependencies
   - ps: cd $Env:project_directory
-  - IF %dependencies%==lowest composer update --prefer-lowest --prefer-stable --no-interaction --no-progress
-  - IF %dependencies%==highest composer update --prefer-stable --no-interaction --no-progress
+  - IF %dependencies%==lowest composer update --prefer-lowest --prefer-dist --no-interaction --no-progress
+  - IF %dependencies%==highest composer update --prefer-dist --no-interaction --no-progress
 
   # Apply patch to jakub-onderka/php-parallel-lint
   - ps: appveyor-retry appveyor DownloadFile https://github.com/slevomat/PHP-Parallel-Lint/commit/50e939edf81619be100186f9c6192d97decad173.diff -FileName php-parallel-lint.patch

composer.json

@@ -1,7 +1,9 @@
 {
 	"name": "slevomat/coding-standard",
-	"license": "MIT",
 	"description": "Slevomat Coding Standard for PHP_CodeSniffer extends Consistence Coding Standard by providing sniffs with additional checks.",
+	"license": "MIT",
+	"minimum-stability": "dev",
+	"prefer-stable": true,
 	"config": {
 		"bin-dir": "bin"
 	},