add PHP 7.3, commented out, to .travis.yml

For #1579

.travis.yml

@@ -15,6 +15,7 @@ language: php
 # - "7.0"
 # - "7.1"
 # - "7.2"
+# - "7.3"
 
 # WordPress version used in first build configuration.
 # env:
@@ -23,7 +24,6 @@ language: php
 # - WP_VERSION=4.8
 # - WP_VERSION=4.7
 # - WP_VERSION=4.6
-# - WP_VERSION=4.5
 #
 # The GUTENBERG env var should be set in WordPress versions where we want to run Gutenberg tests, but Gutenberg has not yet been included in WordPress Core. For 5.0, there is no need to set the GUTENBERG variable.
 #
@@ -62,6 +62,10 @@ matrix:
  # env: WP_VERSION=4.9 WP_TESTS_DIR=/tmp/wordpress/tests/phpunit WP_CORE_DIR=/tmp/wordpress
  # - php: 7.2
  # env: WP_VERSION=5.0 WP_TESTS_DIR=/tmp/wordpress/tests/phpunit WP_CORE_DIR=/tmp/wordpress
+ # - php: 7.3
+ # env: WP_VERSION=4.9 WP_TESTS_DIR=/tmp/wordpress/tests/phpunit WP_CORE_DIR=/tmp/wordpress
+ # - php: 7.3
+ # env: WP_VERSION=5.0 WP_TESTS_DIR=/tmp/wordpress/tests/phpunit WP_CORE_DIR=/tmp/wordpress
 
 
 # Only test the main development branches for now
@@ -76,7 +80,7 @@ before_script:
  - export WP_TESTS_DIR=/tmp/wordpress/tests/phpunit
  - export WP_CORE_DIR=/tmp/wordpress/
  - git clone --depth=1 --branch="$WP_VERSION" git://develop.git.wordpress.org/ $WP_CORE_DIR
- - if [ GUTENBERG ]; then git clone --depth=1 --branch="v4.2.0" https:/WordPress/gutenberg.git $WP_CORE_DIR'src/wp-content/plugins/gutenberg'; fi
+ - if [ GUTENBERG ]; then git clone --depth=1 --branch="v4.6.0" https:/WordPress/gutenberg.git $WP_CORE_DIR'src/wp-content/plugins/gutenberg'; fi
  - cd ..
  - mv $SLUG "$WP_CORE_DIR/src/wp-content/themes/$SLUG"
  - cd $WP_CORE_DIR