Remove mostly redundant second lowest-deps build

Author: OndraM

.travis.yml

@@ -46,12 +46,6 @@ matrix:
       addons:
         chrome: stable
 
-    # Chrome on Travis build with lowest possible dependencies
-    - php: '7.3'
-      env: BROWSER_NAME="chrome" CHROME_HEADLESS="1" DEPENDENCIES="--prefer-lowest"
-      addons:
-        chrome: stable
-
     # Saucelabs builds
     - php: '7.3'
       env: SAUCELABS=1 BROWSER_NAME="firefox" VERSION="47.0" PLATFORM="Windows 10"