Merge pull request #6 from barryvdh/patch-2

Update dependencies and improve version constraints

Author: hkdobrev

composer.json

@@ -11,10 +11,10 @@
     ],
     "require" : {
         "php": ">=5.3.2",
-        "tijsverkoyen/css-to-inline-styles": "1.2.*"
+        "tijsverkoyen/css-to-inline-styles": "~1.5"
     },
     "require-dev" : {
-        "swiftmailer/swiftmailer": "5.0.*"
+        "swiftmailer/swiftmailer": "~5.1"
     },
     "autoload": {
         "psr-0": {"Openbuildings\\Swiftmailer\\": "src/"}