Test Python 3.8 on Travis

Author: wsfulton

.travis.yml

@@ -202,6 +202,11 @@ matrix:
       env: SWIGLANG=python PY3=3 VER=3.7
       sudo: required
       dist: xenial
+    - compiler: gcc
+      os: linux
+      env: SWIGLANG=python PY3=3 VER=3.8
+      sudo: required
+      dist: xenial
     - compiler: gcc
       os: linux
       env: SWIGLANG=python SWIG_FEATURES=-builtin
@@ -217,7 +222,7 @@ matrix:
       sudo: required
       dist: xenial
     - os: linux
-      env: SWIGLANG=python SWIG_FEATURES=-builtin GCC=6 CPP11=1 PY3=3 VER=3.7
+      env: SWIGLANG=python SWIG_FEATURES=-builtin GCC=6 CPP11=1 PY3=3 VER=3.8
       sudo: required
       dist: xenial
     - compiler: gcc
@@ -237,12 +242,17 @@ matrix:
       dist: xenial
     - compiler: gcc
       os: linux
-      env: SWIGLANG=python SWIG_FEATURES="-builtin -O" PY3=3 VER=3.7
+      env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=3 VER=3.8
+      sudo: required
+      dist: xenial
+    - compiler: gcc
+      os: linux
+      env: SWIGLANG=python SWIG_FEATURES="-builtin -O" PY3=3 VER=3.8
       sudo: required
       dist: xenial
     - compiler: gcc
       os: linux
-      env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=3 VER=3.7 SWIGOPTPY3=
+      env: SWIGLANG=python SWIG_FEATURES=-builtin PY3=3 VER=3.8 SWIGOPTPY3=
       sudo: required
       dist: xenial
     - compiler: gcc
@@ -252,7 +262,7 @@ matrix:
       dist: xenial
     - compiler: gcc
       os: linux
-      env: SWIGLANG=python SWIG_FEATURES=-O PY3=3 VER=3.7
+      env: SWIGLANG=python SWIG_FEATURES=-O PY3=3 VER=3.8
       sudo: required
       dist: xenial
     - compiler: gcc
@@ -384,7 +394,7 @@ matrix:
       sudo: required
       dist: xenial
     - os: linux
-      env: SWIGLANG=python GCC=8 CPP17=1 PY3=3 VER=3.7
+      env: SWIGLANG=python GCC=8 CPP17=1 PY3=3 VER=3.8
       sudo: required
       dist: xenial
     - os: linux
@@ -396,7 +406,7 @@ matrix:
       sudo: required
       dist: xenial
     - os: linux
-      env: SWIGLANG=python GCC=9 CPP17=1 PY3=3 VER=3.7
+      env: SWIGLANG=python GCC=9 CPP17=1 PY3=3 VER=3.8
       sudo: required
       dist: xenial
     - compiler: gcc