TASK: Adjust travis

* As this is support branch for TYPO3 6.2, we do not need to cover other
  TYPO3 Versions in travis.

.travis.yml

@@ -17,35 +17,9 @@ env:
     - typo3DatabasePassword=""
   matrix:
     - TYPO3_VERSION="~6.2"
-    - TYPO3_VERSION="~7.6"
-    - TYPO3_VERSION="~8"
-    - TYPO3_VERSION="dev-master"
 
 matrix:
   fast_finish: true
-  exclude:
-    # TYPO3 no longer supports 5.6
-    - env: TYPO3_VERSION="~7.6"
-      php: 5.6
-    - env: TYPO3_VERSION="~8"
-      php: 5.6
-    - env: TYPO3_VERSION="dev-master"
-      php: 5.6
-  allow_failures:
-    # 7 and 8 are not working due to current relation resolving.
-    # See: https://github.com/DanielSiepmann/search_core/projects/1
-    - env: TYPO3_VERSION="~7.6"
-      php: 7.0
-    - env: TYPO3_VERSION="~7.6"
-      php: 7.1
-    - env: TYPO3_VERSION="~8"
-      php: 7.0
-    - env: TYPO3_VERSION="~8"
-      php: 7.1
-    - env: TYPO3_VERSION="dev-master"
-      php: 7.0
-    - env: TYPO3_VERSION="dev-master"
-      php: 7.1
 
 services:
   - mysql