feat add coverage badge

Author: sabakugaara

Diff for: .gitignore

@@ -4,3 +4,4 @@ vendor
 composer.lock
 release*
 .php_cs.cache
+coverage.clover

Diff for: .scrutinizer.yml

@@ -1,3 +1,11 @@
+build:
+    tests:
+        override:
+            -
+                command: phpunit
+                coverage:
+                    file: coverage.clover
+                    format: php-clover
 filter:
     paths:
         - 'src/*'

Diff for: .travis.yml

@@ -4,4 +4,4 @@ php:
 before_script:
   - composer install
 script:
-  - phpunit -c phpunit.xml
+  - phpunit

Diff for: phpunit.xml

@@ -14,4 +14,7 @@
             <file>./tests/UpyunTest.php</file>
         </testsuite>
     </testsuites>
+    <logging>
+        <log type="coverage-clover" target="coverage.clover"/>
+    </logging>
 </phpunit>