init 3.0 schema

by adjust current version and add test for it

schemas/3.0/example.json

@@ -1,5 +1,5 @@
 {
-  "version": "2.1",
+  "version": "3.0",
   "software": {
     "name": "diaspora",
     "version": "0.5.0",

schemas/3.0/schema.json

@@ -1,7 +1,8 @@
 {
+  "title": "NodeInfo schema version 3.0",
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "id": "http://nodeinfo.diaspora.software/ns/schema/2.1#",
-  "description": "NodeInfo schema version 2.1.",
+  "id": "http://nodeinfo.diaspora.software/ns/schema/3.0#",
+  "description": "NodeInfo is an effort to create a standardized way of exposing metadata about a server running one of the distributed social networks.",
   "type": "object",
   "additionalProperties": false,
   "required": [
@@ -15,9 +16,9 @@
   ],
   "properties": {
     "version": {
-      "description": "The schema version, must be 2.1.",
+      "description": "The schema version, must be 3.0.",
       "enum": [
-        "2.1"
+        "3.0"
       ]
     },
     "software": {

tests/spec/nodeinfo_30_spec.rb

@@ -0,0 +1,11 @@
+require "spec_helper"
+
+RSpec.describe "NodeInfo schema 3.0" do
+  it "is a valid draft7 json schema" do
+    expect(schema_for("3.0")).to match_json_schema :json_schema_draft4
+  end
+
+  it "validates the example" do
+    expect(example_for("3.0")).to match_json_schema :nodeinfo_30
+  end
+end