Change pragma-framework/core dependency constraint

Author: pips-

composer.json

@@ -9,7 +9,7 @@
     "require": {
         "php": ">=5.3.0",
         "robmorgan/phinx": "^0.8.0",
-        "pragma-framework/core": "dev-master"
+        "pragma-framework/core": ">=1.0.0"
     },
      "autoload": {
         "psr-0" : { "Pragma\\Historic" : "." }