docs(guide): 7.0.0 migration guide

docs/guides/migration/migration-7.0.0.md

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+# Migration to SDK 7.0.0
+This guide describes the process of migrating to SDK version 7.0.0
+
+## Step 1
+SDK will not accept `url`, `internalUrl` init arguments anymore:
+#### Before
+```js
+Universal({
+    url,
+    internalUrl
+})
+```
+#### After
+```js
+const nodeInstance = await Node({ url, internalUrl })
+Universal({
+    nodes: [{ name: 'testnet', instance: nodeInstance }]
+})
+```
+
+## Step 2
+Remove deprecated function `setKeypair`   
+`SDK` will not accept `keypair` init argument anymore:
+#### Before
+```js
+Universal({ keypair })
+```
+#### After
+```js
+Universal({
+  accounts: [MemoryAccount({ keypair })]
+})
+```
+
+## Step 3
+Change all of `AENS` method's first argument from `nameId` to `name`
+### Before
+```js
+const client = Universal({ ... })
+
+await client.aensUpdate('cm_ad1wdsa...', ...)
+await client.aensTransfer('cm_ad1wdsa...', ...)
+await client.aensRevoke('cm_ad1wdsa...', ...)
+```
+### After
+```js
+const client = Universal({ ... })
+
+await client.aensUpdate('testname.chain', ...)
+await client.aensTransfer('testname.chain', ...)
+await client.aensRevoke('testname.chain', ...)
+```
+
+## Other Breaking Changes
+- Add new compiler `methods` to RPC `communication` (base-app update required)
+- Drop compiler version to `version >= 4.0.0 && version < 5.0.0`
+- Change node compatibility range to `node >= 5.0.0 && node < 6.0.0`
+- Always `verify` transactions before sending them to the node (can be disabled using the option `verify: false`)