added coverity to travis configuration

.travis.yml

@@ -5,7 +5,8 @@ jdk:
 
 env:
   global:
-    - secure: "Lgj042RD0X3rB8VZVZLWP1GetLhjd3PqI5JbJMlzgHJpDI6RkFIBLN9SWAGmkLPCehIp2zA5tu9+UVy0NNMxm9xz6SyjMCaxS28/fnYEXaNmwwDSF6O6gLUbdxyzoYIFPYOPmFxpzhebqnNIsxaM29oZpgRgUGqosCczQxiB+Ng="
+    - secure: "Lgj042RD0X3rB8VZVZLWP1GetLhjd3PqI5JbJMlzgHJpDI6RkFIBLN9SWAGmkLPCehIp2zA5tu9+UVy0NNMxm9xz6SyjMCaxS28/fnYEXaNmwwDSF6O6gLUbdxyzoYIFPYOPmFxpzhebqnNIsxaM29oZpgRgUGqosCczQxiB+Ng=" #coveralls
+    - secure: "IfYURwZaDWuBDvyn47n0k1Zod/IQw1FF+CS5nnV08Q+NfC3vGGJMwV8m59XnbfwnWGxwvCaAbk4qP6s6+ijgZNKkvgfFMo3rfTok5zt43bIqgaFOANYV+OC/1c59gYD6ZUxhW5iNgMgU3qdsRtJuwSmfkVv/jKyLGfAbS4kN8BA=" #coverity
 
 before_install: "curl -L --cookie 'oraclelicense=accept-securebackup-cookie;'  http://download.oracle.com/otn-pub/java/jce/8/jce_policy-8.zip -o /tmp/policy.zip && sudo unzip -j -o /tmp/policy.zip *.jar -d `jdk_switcher home oraclejdk8`/jre/lib/security && rm /tmp/policy.zip"
 
@@ -28,6 +29,14 @@ notifications:
 
 before_deploy: mvn -fmain/pom.xml -Puber-jar clean package -DskipTests
 
+addons:
+  coverity_scan:
+    project:
+      name: "cryptomator/cryptomator"
+    notification_email: sebastian.stenzel@cryptomator.org
+    build_command: "mvn -fmain/pom.xml clean test"
+    branch_pattern: coverity_scan
+
 deploy:
   provider: releases
   prerelease: true