Update .travis.yml

.travis.yml

@@ -28,6 +28,36 @@ matrix:
       compiler: g++
       env: TOOLSET=gcc CXXSTD=03,11
 
+    - os: linux
+      compiler: g++-5
+      env: TOOLSET=gcc-5 CXXSTD=03,11,14,1z
+      addons:
+        apt:
+          packages:
+            - g++-5
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      compiler: g++-6
+      env: TOOLSET=gcc-6 CXXSTD=03,11,14,1z
+      addons:
+        apt:
+          packages:
+            - g++-6
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      compiler: g++-7
+      env: TOOLSET=gcc-7 CXXSTD=03,11,14,17
+      addons:
+        apt:
+          packages:
+            - g++-7
+          sources:
+            - ubuntu-toolchain-r-test
+
     - os: linux
       compiler: clang++
       env: TOOLSET=clang CXXSTD=03,11,14,1z
@@ -56,7 +86,7 @@ install:
   - ./b2 headers
 
 script:
-  - ./b2 libs/statechart/test toolset=$TOOLSET cxxstd=$CXXSTD
+  - ./b2 -j3 libs/statechart/test toolset=$TOOLSET cxxstd=$CXXSTD
 
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