Fix up travis CI

Author: Ben Krikler

.travis.yml

@@ -2,10 +2,9 @@ dist: xenial
 language: python
 
 python:
- - "2.7"
- - "3.5"
  - "3.6"
  - "3.7"
+ - "3.8"
 
 install:
   - pip install -r .requirements_dev.txt
@@ -32,4 +31,4 @@ deploy:
   on:
     tags: true
     repo: FAST-HEP/fast-carpenter
-    condition: "$TRAVIS_PYTHON_VERSION == 3.6 && $TRAVIS_TAG =~ ^v[0-9]+[.][0-9]+[.][0-9]+(-rc[0-9]+|[.]dev[0-9]+)?$"
+    condition: "$TRAVIS_PYTHON_VERSION == 3.7 && $TRAVIS_TAG =~ ^v[0-9]+[.][0-9]+[.][0-9]+(-rc[0-9]+|[.]dev[0-9]+)?$"