package.json: Version 1.0.0

* Version v1.0.0 is a backwards-compatible change in the API. Now,
  `Message#respond` returns the response message, so that users can
  access properties like the response header.

package.json

@@ -1,6 +1,6 @@
 {
     "name": "jmp",
-    "version": "0.7.6",
+    "version": "1.0.0",
     "description": "Node.js module for creating, parsing and replying to messages of the Jupyter Messaging Protocol (JMP)",
     "keywords": [
         "jupyter",