Update composer.json

- Added manual sabre/uri requirement because of an incorrect dependency definition in sabre/xml.
- Removed version. Grab version from tag
- Changed dev-master to 1.x-dev

composer.json

@@ -1,14 +1,13 @@
 {
     "name": "marknl/iodef",
     "description": "Library for parsing IODEF in PHP",
-    "version": "1.0.3",
     "keywords": ["iodef", "rfc5070"],
     "homepage": "http://e-rave.nl/iodef",
     "type": "library",
     "license": "GPL-2.0",
     "extra": {
         "branch-alias": {
-            "dev-master": "1.0.x-dev"
+            "dev-master": "1.x-dev"
         }
     },
     "authors": [
@@ -25,8 +24,9 @@
     },
     "require": {
         "php": ">=5.5.0",
-        "sabre/xml": "^1.2",
-        "vlucas/valitron": "~1.2.4"
+	"sabre/xml": "1.5.*",
+	"sabre/uri": "1.2.*",
+        "vlucas/valitron": "1.3.*"
     },
     "autoload": {
         "psr-4": {