dropped support for php 5.x for phpunit, and php 5.x is old

Author: cbschuld

Diff for: .travis.yml

@@ -5,9 +5,6 @@ dist: precise
 php:
   - 7.3
   - 7.2
-  - 5.6
-  - 5.5
-  - 5.4
 
 install: composer install
 

Diff for: CHANGELOG.md

@@ -10,7 +10,9 @@ changes when it socially makes sense.
 ## [1.9.2] - 2019-06-26
 ### Added
 - PHPUnit Tests for Firefox, Opera and Chrome (3684 tests, 7368 assertions)
-- Stronger tests for Firefox
+- Stronger tests for Firefox and Chrome
+### Removed
+- Dropped support for 5.x PHP due to updates to PHPUnit and legacy nature of 5.X
 
 ## [1.9.1] - 2019-06-19
 ### Added

Diff for: composer.json

@@ -19,7 +19,7 @@
         "classmap": ["lib/Browser.php"]
     },
     "require": {
-        "php": ">=5.4"
+        "php": ">=7.2"
     },
     "extra": {
         "branch-alias": {