ci - Remove old ubuntu versions & use only 2 threads to build

.travis.yml

@@ -10,22 +10,6 @@ env:
 
 matrix:
   include:
-    - name: "Ubuntu 16.04 - gcc-5.4 (Release)"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: gcc
-      env:
-        - BUILD_TYPE="Release"
-
-    - name: "Ubuntu 16.04 - gcc-5.4 (Debug)"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: gcc
-      env:
-        - BUILD_TYPE="Debug"
-
     - name: "Ubuntu 18.04 - gcc (Release)"
       os: linux
       dist: bionic
@@ -58,49 +42,6 @@ matrix:
       env:
         - BUILD_TYPE="Debug"
 
-    - name: "Ubuntu 16.04 - gcc-5.4 with coverage"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: gcc
-      env:
-        - WITH_COVERAGE=1
-        - BUILD_TYPE="Release"
-
-    - name: "Ubuntu 16.04 - gcc-5.4 with Valgrind"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: gcc
-      env:
-        - WITH_VALGRIND=1
-        - BUILD_TYPE="Release"
-
-    - name: "Ubuntu 16.04 - gcc-5.4 with sanitizers"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: gcc
-      env:
-        - WITH_SANITIZERS=1
-        - BUILD_TYPE="Release"
-
-    - name: "Ubuntu 16.04 - CLANG 7.0 (Release)"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: clang
-      env:
-        - BUILD_TYPE="Release"
-
-    - name: "Ubuntu 16.04 - CLANG 7.0 (Debug)"
-      os: linux
-      dist: xenial
-      sudo: required
-      compiler: clang
-      env:
-        - BUILD_TYPE="Debug"
-
     - name: "macOS 10.14 - XCode 11.3"
       os: osx
       osx_image: xcode11.3

ci/run.sh

@@ -28,7 +28,7 @@ mkdir build && cd build
 conan install .. -o webready=True --build missing
 
 cmake ${CMAKE_OPTIONS} ..
-make  -j
+make  -j2
 
 make  tests
 make  install