test: update compiler used for testing (#1079)

Looks like github no longer has ubuntu 16 so we'll
need to update the compiler and remove 10.x testing.

Author: mhdawson

.github/workflows/ci.yml

@@ -8,16 +8,14 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - node/10
           - node/12
           - node/14
-          - node/15
           - node/16
         compiler:
           - gcc
           - clang
         os:
-          - ubuntu-16.04 # ubuntu-18.04/ubuntu-latest missing package g++-4.9
+          - ubuntu-18.04
           - macos-latest
     runs-on: ${{ matrix.os }}
     steps:
@@ -27,7 +25,7 @@ jobs:
         if [ "${{ matrix.compiler }}" = "gcc" -a "${{ matrix.os }}" = ubuntu-* ]; then
           sudo add-apt-repository ppa:ubuntu-toolchain-r/test
           sudo apt-get update
-          sudo apt-get install g++-4.9
+          sudo apt-get install g++-6.5
         fi
     - name: Use Node.js ${{ matrix.node-version }}
       run: |
@@ -45,7 +43,7 @@ jobs:
           export CC="gcc" CXX="g++"
         fi
         if [ "${{ matrix.compiler }}" = "gcc" -a "${{ matrix.os }}" = ubuntu-* ]; then
-          export CC="gcc-4.9" CXX="g++-4.9" AR="gcc-ar-4.9" RANLIB="gcc-ranlib-4.9" NM="gcc-nm-4.9"
+          export CC="gcc-6.5" CXX="g++-6.5" AR="gcc-ar-6.5" RANLIB="gcc-ranlib-6.5" NM="gcc-nm-6.5"
         fi
         if [ "${{ matrix.compiler }}" = "clang" ]; then
           export CC="clang" CXX="clang++"