fix Travis-CI config and add Coveralls config

.coveralls.yml

@@ -0,0 +1 @@
+json_path: coveralls-upload.json

.travis.yml

@@ -5,9 +5,9 @@ dist: trusty
 matrix:
   include:
     - php: 7.1
-      env: ANALYSIS='true'
     - php: 7.2
     - php: 7.3
+      env: ANALYSIS='true'
     - php: nightly
   allow_failures:
     - php: nightly
@@ -18,9 +18,6 @@ before_script:
 
 script:
   - if [[ "$ANALYSIS" == 'true' ]]; then vendor/bin/phpunit --coverage-clover clover.xml ; fi
-  - vendor/bin/phpunit
-  - vendor/bin/phpcs
-  - vendor/bin/phpstan analyse Slim
 
 after_success:
   - if [[ "$ANALYSIS" == 'true' ]]; then vendor/bin/php-coveralls --coverage_clover=clover.xml -v ; fi