Merge branch 'master' of github.com:basvandorst/StravaPHP into master

Author: vredeling

.travis.yml

@@ -1,6 +1,6 @@
 language: php
 php:
-  - 7.1
+  - 7.3
 install:
   - composer --no-interaction install
 script: phpunit --configuration phpunit.xml --coverage-clover=coverage.clover