readme: include log and key api in generic operations.(#544)

Author: nunofmn

README.md

@@ -225,16 +225,14 @@ This means:
 - [`ipfs.version([callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic#version)
 - [`ipfs.ping()`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic#ping)
 
-#### [log](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
-
-- [`ipfs.log.ls([callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
-- [`ipfs.log.tail([callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
-- [`ipfs.log.level(subsystem, level, [options, callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
-
-#### [key](https://github.com/ipfs/interface-ipfs-core/tree/master/API/key)
-
-- [`ipfs.key.gen(name, [options, callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/key#gen)
-- [`ipfs.key.list([options, callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/key#list)
+- log:
+  - [`ipfs.log.ls([callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
+  - [`ipfs.log.tail([callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
+  - [`ipfs.log.level(subsystem, level, [options, callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/generic)
+
+- key:
+  - [`ipfs.key.gen(name, [options, callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/key#gen)
+  - [`ipfs.key.list([options, callback])`](https://github.com/ipfs/interface-ipfs-core/tree/master/API/key#list)
 
 ##### [name](https://github.com/ipfs/interface-ipfs-core/tree/master/API/name)