refactor: async await roundup (#1173)

This is a round up of the remaining async/await PRs along with some cleanup and docs fixes.

resolves #1103
resolves #1122
resolves #1158 (hopefully!)
closes #1164
closes #1165
closes #1166
closes #1169
closes #1170
closes #1172

BREAKING CHANGE: The `log.tail` method now returns an async iterator that yields log messages. Use it like:

```js
for await (const message of ipfs.log.tail()) {
  console.log(message)
}
```

BREAKING CHANGE: The response to a call to `log.level` now returns an object that has camel cased keys. i.e. `Message` and `Error` properties have changed to `message` and `error`.

BREAKING CHANGE: Dropped support for go-ipfs <= 0.4.4 in `swarm.peers` response.

BREAKING CHANGE: The signature for `ipfs.mount` has changed from `ipfs.mount([ipfsPath], [ipnsPath])` to `ipfs.mount([options])`. Where `options` is an optional object that may contain two boolean properties `ipfsPath` and `ipnsPath`. The response object has also changed to be camel case. See https://docs.ipfs.io/reference/api/http/#api-v0-mount.

BREAKING CHANGE: Default ping `count` of 1 in client has been removed. The default ping count is now whatever the IPFS node defaults it to (currently 10). If you specifically need 1 ping message then please pass `count: 1` in options for `ipfs.ping()`.

BREAKING CHANGE: Multi parameter constructor options are no longer supported. To create a new IPFS HTTP client, pass a single parameter to the constructor. The parameter can be one of:

* String, formatted as one of:
    * Multiaddr e.g. /ip4/127.0.0.1/tcp/5001
    * URL e.g. http://127.0.0.1:5001
* [Multiaddr](https://www.npmjs.com/package/multiaddr) instance
* Object, in format of either:
    * Address and path e.g. `{ apiAddr: '/ip4/127.0.0.1/tcp/5001': apiPath: '/api/v0' }` (Note: `apiAddr` can also be a string in URL form or a Multiaddr instance)
    * Node.js style address e.g. `{ host: '127.0.0.1', port: 5001, protocol: 'http' }`

Author: Alan Shaw

Diff for: README.md

@@ -42,7 +42,6 @@
   },
   "dependencies": {
     "abort-controller": "^3.0.0",
-    "async": "^2.6.1",
     "async-iterator-all": "^1.0.0",
     "async-iterator-to-pull-stream": "^1.3.0",
     "bignumber.js": "^9.0.0",
@@ -51,58 +50,47 @@
     "buffer": "^5.4.2",
     "callbackify": "^1.1.0",
     "cids": "~0.7.1",
-    "concat-stream": "github:hugomrdias/concat-stream#feat/smaller",
     "debug": "^4.1.0",
-    "detect-node": "^2.0.4",
     "err-code": "^2.0.0",
     "explain-error": "^1.0.4",
-    "flatmap": "0.0.3",
     "form-data": "^3.0.0",
-    "glob": "^7.1.3",
     "ipfs-block": "~0.8.1",
     "ipfs-utils": "^0.4.0",
     "ipld-dag-cbor": "~0.15.0",
     "ipld-dag-pb": "^0.18.1",
     "ipld-raw": "^4.0.0",
     "is-ipfs": "~0.6.1",
-    "is-pull-stream": "0.0.0",
-    "is-stream": "^2.0.0",
-    "iso-stream-http": "~0.1.2",
     "it-glob": "0.0.6",
-    "it-tar": "^1.1.0",
+    "it-tar": "^1.1.1",
     "it-to-stream": "^0.1.1",
     "iterable-ndjson": "^1.1.0",
-    "kind-of": "^6.0.2",
     "ky": "^0.15.0",
     "ky-universal": "^0.3.0",
     "merge-options": "^2.0.0",
     "multiaddr": "^6.0.6",
+    "multiaddr-to-uri": "^5.0.0",
     "multibase": "~0.6.0",
     "multicodec": "~0.5.1",
     "multihashes": "~0.4.14",
-    "ndjson": "github:hugomrdias/ndjson#feat/readable-stream3",
-    "once": "^1.4.0",
     "parse-duration": "^0.1.1",
     "peer-id": "~0.12.3",
     "peer-info": "~0.15.1",
-    "promise-nodeify": "^3.0.1",
-    "promisify-es6": "^1.0.3",
-    "pull-defer": "~0.2.3",
-    "pull-stream": "^3.6.9",
-    "pull-to-stream": "~0.1.1",
-    "pump": "^3.0.0",
-    "qs": "^6.5.2",
-    "readable-stream": "^3.1.1",
-    "stream-to-pull-stream": "^1.7.2"
+    "promise-nodeify": "^3.0.1"
   },
   "devDependencies": {
     "aegir": "^20.4.1",
+    "async": "^3.1.0",
     "browser-process-platform": "~0.1.1",
     "cross-env": "^6.0.0",
+    "detect-node": "^2.0.4",
     "go-ipfs-dep": "^0.4.22",
-    "interface-ipfs-core": "^0.120.0",
+    "interface-ipfs-core": "^0.121.0",
     "ipfsd-ctl": "^0.47.1",
+    "ndjson": "^1.5.0",
     "nock": "^11.4.0",
+    "promisify-es6": "^1.0.3",
+    "pull-stream": "^3.6.14",
+    "pump": "^3.0.0",
     "stream-equal": "^1.1.1"
   },
   "engines": {