add back coverage

Author: SimonDanisch

.travis.yml

@@ -8,3 +8,9 @@ julia:
   - nightly
 notifications:
   email: false
+
+after_success:
+  # push coverage results to Coveralls
+  - julia -e 'cd(Pkg.dir("SignedDistanceFields")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(Coveralls.process_folder())'
+  # push coverage results to Codecov
+  - julia -e 'cd(Pkg.dir("SignedDistanceFields")); Pkg.add("Coverage"); using Coverage; Codecov.submit(Codecov.process_folder())'