travis config: fix intents for coverity analysis.

.travis.yml

@@ -12,7 +12,7 @@ addons:
       name: "assimp/assimp"
       version: 3.2
       description: "The Asset Importer Lib coverity run, branch coverity_scan"
-      notification_email: [email protected]
-      build_command_prepend: cmake -G "Unix Makefiles" -DASSIMP_ENABLE_BOOST_WORKAROUND=YES
-      build_command: make
-      branch_pattern: coverity_scan
+    notification_email: [email protected]
+    build_command_prepend: cmake -G "Unix Makefiles" -DASSIMP_ENABLE_BOOST_WORKAROUND=YES
+    build_command: make
+    branch_pattern: coverity_scan