Add manifest (Level/community#83) (#198)

* Upgrade abstract-leveldown from ~6.1.0 to ~6.2.1
* Add manifest

Author: vweevers

memdown.js

@@ -155,7 +155,13 @@ MemIterator.prototype._seek = function (target) {
 function MemDOWN () {
   if (!(this instanceof MemDOWN)) return new MemDOWN()
 
-  AbstractLevelDOWN.call(this)
+  AbstractLevelDOWN.call(this, {
+    bufferKeys: true,
+    snapshots: true,
+    permanence: false,
+    seek: true,
+    clear: true
+  })
 
   this._store = createRBT(ltgt.compare)
 }

package.json

@@ -28,7 +28,7 @@
     "./immediate.js": "./immediate-browser.js"
   },
   "dependencies": {
-    "abstract-leveldown": "~6.1.0",
+    "abstract-leveldown": "~6.2.1",
     "functional-red-black-tree": "~1.0.1",
     "immediate": "~3.2.3",
     "inherits": "~2.0.1",