[breaking] Drop support for clang 3.9.1

.travis.yml

@@ -2,16 +2,6 @@ language: cpp
 
 matrix:
   include:
-    - os: linux
-      dist: trusty
-      sudo: false
-      compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.9']
-          packages: ['g++-5', 'llvm-3.9', 'clang-3.9', 'libclang-3.9-dev']
-      env: TOOLSET=g++-5 LLVM_VERSION=3.9 LLVM_CONFIG_BINARY=/usr/bin/llvm-config-3.9
-
     - os: linux
       dist: trusty
       sudo: false
@@ -22,16 +12,6 @@ matrix:
           packages: ['g++-5', 'lcov', 'llvm-4.0', 'clang-4.0', 'libclang-4.0-dev']
       env: TOOLSET=g++-5 CPPAST_TEST_GCOV=ON LLVM_VERSION=4.0 LLVM_CONFIG_BINARY=/usr/bin/llvm-config-4.0
 
-    - os: linux
-      dist: trusty
-      sudo: false
-      compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.9']
-          packages: ['g++-4.9', 'g++-5', 'llvm-3.9', 'clang-3.9', 'libclang-3.9-dev']
-      env: TOOLSET=clang++-3.9 LLVM_VERSION=3.9 LLVM_CONFIG_BINARY=/usr/bin/llvm-config-3.9
-
     - os: linux
       dist: trusty
       sudo: false
@@ -74,7 +54,7 @@ script:
   - mkdir build/ && cd build/
   - $CMAKE -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Werror -pedantic -Wall -Wextra -Wconversion -Wsign-conversion -Wno-parentheses -Wno-assume" ../ -DCPPAST_TEST_GCOV=$CPPAST_TEST_GCOV -DLLVM_CONFIG_BINARY=$LLVM_CONFIG_BINARY
   - $CMAKE --build .
-  - if [[ "$LLVM_VERSION" == "4.0" ]]; then ./test/cppast_test \*; else ./test/cppast_test; fi
+  - ./test/cppast_test \*
 
 after_script:
   - if [[ "$CPPAST_TEST_GCOV" == "ON" ]]; then $CMAKE --build . --target cppast_coverage && cd ../ && coveralls --no-gcov --lcov-file build/cppast_coverage.info.cleaned; fi