Require latest traderinteractive/filter-strings

Author: chadicus

composer.json

@@ -35,7 +35,7 @@
         "traderinteractive/filter-dates": "^3.0",
         "traderinteractive/filter-floats": "^3.0",
         "traderinteractive/filter-ints": "^3.0",
-        "traderinteractive/filter-strings": "^3.0"
+        "traderinteractive/filter-strings": "^3.1"
     },
     "require-dev": {
         "php-coveralls/php-coveralls": "^1.0",