Uppercase the HTTP method name

This fixes PUT/DELETE for IE 9 and PATCH for Node.js.

fetch.js

@@ -115,7 +115,7 @@
     this.body = options.body
     this.credentials = options.credentials || null
     this.headers = new Headers(options.headers)
-    this.method = options.method || 'GET'
+    this.method = (options.method || 'GET').toUpperCase()
     this.mode = options.mode || null
     this.referrer = null
   }

test/test.js

@@ -165,3 +165,44 @@ asyncTest('rejects text promise after body is consumed', 2, function() {
     start()
   })
 })
+
+asyncTest('supports HTTP PUT', 2, function() {
+  fetch('/request', {
+    method: 'put',
+    body: {
+      name: 'Hubot',
+      title: 'Hubot Robawt',
+    }
+  }).then(function(response) {
+    var request = JSON.parse(response.body);
+    equal(request.method, 'PUT')
+    equal(request.data, 'name=Hubot&title=Hubot+Robawt')
+    start()
+  })
+})
+
+asyncTest('supports HTTP PATCH', 2, function() {
+  fetch('/request', {
+    method: 'patch',
+    body: {
+      name: 'Hubot',
+      title: 'Hubot Robawt',
+    }
+  }).then(function(response) {
+    var request = JSON.parse(response.body);
+    equal(request.method, 'PATCH')
+    equal(request.data, 'name=Hubot&title=Hubot+Robawt')
+    start()
+  })
+})
+
+asyncTest('supports HTTP DELETE', 2, function() {
+  fetch('/request', {
+    method: 'delete',
+  }).then(function(response) {
+    var request = JSON.parse(response.body);
+    equal(request.method, 'DELETE')
+    equal(request.data, '')
+    start()
+  })
+})