Move composer from before_script to install in .travis.yml.

Update call to composer update to composer install in .travis.yml.
Add php-semver-checker-git.yml.dist to start using php-semver-checker-git configuration file.
Download php-semver-checker-git from psvcg.coreteks.org.

Author: tomzx

.travis.yml

@@ -9,15 +9,15 @@ php:
 
 sudo: false
 
-before_script:
+install:
     - composer self-update
-    - composer update
+    - composer install --no-interaction --prefer-source
 
 script:
     - php vendor/bin/phpunit
 
 after_script:
     - wget https://scrutinizer-ci.com/ocular.phar
     - php ocular.phar code-coverage:upload --format=php-clover log/coverage.xml
-    - wget https://tomzx.github.io/php-semver-checker-git/php-semver-checker-git.phar
-    - php php-semver-checker-git.phar suggest --allow-detached -vvv --details --include-before=src --include-after=src
+    - wget http://psvcg.coreteks.org/php-semver-checker-git.phar
+    - php php-semver-checker-git.phar suggest -vvv

php-semver-checker-git.yml.dist

@@ -0,0 +1,4 @@
+allow-detached: true
+details: true
+include-before: src
+include-after: src