Reduce min required PHP version from 7.2 to 7.1

Author: marc-mabe

.travis.yml

@@ -16,6 +16,9 @@ env:
 matrix:
   fast_finish: true
   include:
+    - php: 7.1
+      env:
+        - CODE_COVERAGE="1"
     - php: 7.2
       env:
         - CODE_COVERAGE="1"

README.md

@@ -455,7 +455,7 @@ Critical bug fixes and security relates fixes can also be backported to older re
 | 1.x     | EOL          | \>=5.3          |
 | 2.x     | maintainance | \>=5.3 & HHVM<4 |
 | 3.x     | active       | \>=5.6 & HHVM<4 |
-| 4.x     | development  | \>=7.2          |
+| 4.x     | development  | \>=7.1          |
 
 
 # New BSD License

composer.json

@@ -17,7 +17,7 @@
     }],
     "license": "BSD-3-Clause",
     "require": {
-        "php":            ">=7.2",
+        "php":            ">=7.1",
         "ext-reflection": "*"
     },
     "require-dev": {