travis: Enable codecoverage for jvm build

.travis.yml

@@ -18,7 +18,7 @@ before_install:
  - export PATH=${PATH}:./vendor/bundle
  - if [[ ! -z "$HydraLicense" ]]; then
      mkdir -p  /home/travis/.triplequote/metrics/config && echo "$HydraLicense" > "/home/travis/.triplequote/hydra.license" && cp hydra-metrics-service.conf /home/travis/.triplequote/metrics/config/metrics-service.conf;
-   fi  
+   fi
 
 stages:
   - name: styling
@@ -29,28 +29,21 @@ stages:
 jobs:
   include:
     # it can speed up the overall build to have the longer-running jobs at the top of this list.
-    - stage: test 
-      env: TEST="coverage"
-      install: pip install --user codecov
-      script: sbt coverage buildJVM bench/test coverageReport && codecov
-
     - stage: test
       env: TEST="JS tests"
       # http://austinpray.com/ops/2015/09/20/change-travis-node-version.html
       install: rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm install $TRAVIS_NODE_VERSION
       script: sbt ++$TRAVIS_SCALA_VERSION! validateJS && sbt ++$TRAVIS_SCALA_VERSION! validateKernelJS && sbt ++$TRAVIS_SCALA_VERSION! validateFreeJS
       scala: *scala_version_212
 
-    - &jvm_tests
-      stage: test
+    - stage: test
       env: TEST="JVM tests"
-      script: sbt ++$TRAVIS_SCALA_VERSION! buildJVM bench/test
-      scala: *scala_version_212
-    - <<: *jvm_tests
-      scala: *scala_version_213
-      # the bench module has dependencies not available in Scala 2.13, so don't test it
-      script: sbt ++$TRAVIS_SCALA_VERSION! buildJVM
-
+      install: pip install --user codecov
+      script: sbt ++$TRAVIS_SCALA_VERSION! coverage buildJVM bench/test coverageReport && codecov
+      scala:
+      - *scala_version_212
+      - *scala_version_213
+
     - stage: test
       env: TEST="docs"
       install: gem install jekyll -v 2.5
@@ -59,7 +52,7 @@ jobs:
     - stage: test
       env: TEST="scalafix"
       script: cd scalafix && sbt tests/test
-   
+
     - stage: test
       env: TEST="binary compatibility"
       script: sbt ++$TRAVIS_SCALA_VERSION! validateBC