travis do only 2 builds, closes #3357

.travis.yml

@@ -1,50 +1,36 @@
-#
-# Travis configuration guide for R language:
-#   https://docs.travis-ci.com/user/languages/r/
-#   https://github.com/craigcitro/r-travis/wiki/Porting-to-native-R-support-in-Travis
-#
 language: r
 dist: trusty
 sudo: required
 cache: packages
 warnings_are_errors: true
-r_check_args: ""
-# empty r_check_args to turn off --as-cran (on by default) as that can be slow
 
 branches:
   only:
     - "master"
 
 r:
-  - oldrel
   - release
-  - devel
 
 os:
   - linux
   - osx
 
-matrix:
-  exclude:
-    - r: devel  # exclude osx r-devel build as it is currently unstable
-      os: osx
-
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install llvm &&
     export PATH="/usr/local/opt/llvm/bin:$PATH" &&
     export LDFLAGS="-L/usr/local/opt/llvm/lib" &&
     export CFLAGS="-I/usr/local/opt/llvm/include"; fi
 
 r_packages:
-  - covr
-  - drat
+  - covr      # used for code coverage reports in github pull requests
+  - drat      # used in deploy.sh to publish tar.gz to github.io/Rdatatable/data.table
   - devtools  # explicitly named temp fix for #2801
 
 before_script:
   - echo "Revision:" $TRAVIS_COMMIT >> ./DESCRIPTION
 
 after_success:
-  - travis_wait Rscript -e 'library(covr);codecov()'
+  - travis_wait Rscript -e 'library(covr); codecov()'
   - test $TRAVIS_REPO_SLUG == "Rdatatable/data.table" &&
     test $TRAVIS_PULL_REQUEST == "false" &&
     test $TRAVIS_BRANCH == "master" &&
@@ -59,5 +45,6 @@ env:
   global:
     - PKG_CFLAGS="-O3 -Wall -pedantic"
     - _R_CHECK_NO_STOP_ON_TEST_ERROR_=true
+    - _R_CHECK_CRAN_INCOMING_REMOTE_=false
     # drat using @jangorecki token
     - secure: "CxDW++rsQApQWos+h1z/F76odysyD6AtXJrDwlCHlgqXeKJNRATR4wZDDR18SK+85jUqjoqOvpyrq+5kKuyg6AnA/zduaX2uYE5mcntEUiyzlG/jJUKbcJqt22nyAvFXP3VS60T2u4H6IIhVmr7dArdxLkv8W+pJvf2Tg6kx8Ws="