wrong php version constraint :( also readme

Author: adrian-enspired

README.md

@@ -5,17 +5,11 @@ util
 
 Various PHP utilities for general use.
 
-* #### Arrays
+* **Arrays**: Utility functions for arrays; also proxies many built-in php array functions, and removes the by-reference behavior found on the `*sort()` functions and some others.
 
-Utility functions for arrays; also proxies many built-in php array functions, and removes the by-reference behavior found on the `*sort()` functions and some others.
+* **Json**: Encoding and decoding with sensible defaults and exception-based error handling.
 
-* #### Json
-
-Sensible defaults and exception-based error handling.
-
-* #### Value
-
-General variable handling utilties, debugging, and type/pseudotype checking.
+* **Value**: General variable handling utilties, debugging, and type/pseudotype checking.
 
 dependencies
 ------------

composer.json

@@ -15,7 +15,7 @@
     "irc": "irc://irc.freenode.net/php-enspired"
   },
   "require": {
-    "php": "^7.0",
+    "php": "^7.1",
     "php-enspired/exceptable": "^1.1"
   },
   "require-dev": {