try adding coverity scan

.travis.yml

@@ -1,19 +1,33 @@
 sudo: false
 language: c
 compiler:
-  - gcc
-  - clang
+- gcc
+- clang
 script: s/travis-build
 addons:
   apt:
     packages:
-      - liblua5.2-dev
-      - libncurses5-dev
-      - libsqlite3-dev
-      - libxml2-dev
-      - valgrind
+    - liblua5.2-dev
+    - libncurses5-dev
+    - libsqlite3-dev
+    - libxml2-dev
+    - valgrind
 os:
-  - linux
+- linux
 notifications:
   slack:
     secure: F89aXLWaE125PaJIlETv12jT4EfH6wLXJmGCPZzrN3OcLn2ahDWqjwuzR7lOEDf2nAISmeMPyDZMhEHXLNHAE5qP6lg9yliYQw5hzGmDK9m1xUq/pPEne/b2Y7K3my1mkRZ6n3asbHgSmBWAfCIk1JN8R5Rv+rmbLuWLc+zofts=
+env:
+  global:
+    secure: SOuZkWHfQmKf7qCVkK8WSsTU7R9f2nJYh1tMFdiauVKfdOSqYZwoPomp9S+7cPZhGrYEZ91mPadrWGTD/02c+tXVOJA51JGzvM55kl8Dy1htqHt7thCjAr1cDRh/Ek+qLGGf4CwAlzO/xnSUCttvioT8F678HJgArwqnR6i3Mgc=
+
+addons:
+  coverity_scan:
+    project:
+      name: "eressea/server"
+      description: "Eressea PBEM server"
+    notification_email: enno.rehling@gmail.com
+    build_command: s/travis-build
+    branch_pattern: coverity_scan
+#    build_command_prepend: "<Your build preprocessing command here>"
+