ci: report coverage for Python

Author: blueyed

.coveragerc

@@ -1,3 +1,4 @@
 [run]
 plugins = covimerage
 data_file = .coverage_covimerage
+branch = 1

.travis.yml

@@ -20,22 +20,24 @@ jobs:
       - VIM_VERSION=master
       - MAKE_TARGET=vim/test
       - TEST_PROFILE=vim-profile-master.txt
+      - TEST_PYTHON=python3
     - name: Installed Vim with checks
       env:
       - VIM_VERSION=installed
       - MAKE_TARGET=test
       - TEST_PROFILE=vim-profile-installed.txt
-      - TEST_PYTHON=python3
+      - TEST_PYTHON="python -m coverage run --append"
 
 install:
   - |
     if [ "$VIM_VERSION" = 'installed' ]; then
-      pip install -q --user flake8 git+https://github.com/Kuniwak/vint
+      python -m pip install -q --user flake8 git+https://github.com/Kuniwak/vint
     else
       bash scripts/install-vim.sh
       export PATH=$HOME/vim/bin:$PATH
     fi
-  - pip install covimerage --user
+  - python -m pip install -q --user covimerage
+  - python -m pip freeze
 
 script:
   - uname -a
@@ -44,6 +46,7 @@ script:
   - make --keep-going $MAKE_TARGET
 
 after_success:
-  - covimerage write_coverage $TEST_PROFILE
+  - covimerage write_coverage --append $TEST_PROFILE
+  - coverage report -m
   - coverage xml
   - bash <(curl -s https://codecov.io/bash) -f coverage.xml