CHANGELOG: update for RC2

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

CHANGELOG.md

 # go-ipfs changelog
 
-## 0.4.18 2018-10-26-rc1
+## 0.4.18-rc2 2018-10-26
 
 This is probably one of the largest go-ipfs release in recent history, 3 months
 in the making.
@@ -309,6 +309,12 @@ Regressions Fixes (fixes for bugs introduced since the last release):
   - fix infinite loop in `stats bw` ([ipfs/go-ipfs#5598](https://github.com/ipfs/go-ipfs/pull/5598))
   - make warnings on no bootstrap peers less noisy ([ipfs/go-ipfs#5466](https://github.com/ipfs/go-ipfs/pull/5466))
   - fix two transport related bugs ([ipfs/go-ipfs#5417](https://github.com/ipfs/go-ipfs/pull/5417))
+  - Fix pin ls output when hash is specified ([ipfs/go-ipfs#5699](https://github.com/ipfs/go-ipfs/pull/5699))
+  - ping: switch to the ping service enabled in the libp2p constructor ([ipfs/go-ipfs#5698](https://github.com/ipfs/go-ipfs/pull/5698))
+  - commands: fix a bunch of tiny commands-lib issues ([ipfs/go-ipfs#5697](https://github.com/ipfs/go-ipfs/pull/5697))
+  - cleanup the ping command ([ipfs/go-ipfs#5680](https://github.com/ipfs/go-ipfs/pull/5680))
+  - fix gossipsub goroutine explosion ([ipfs/go-ipfs#5688](https://github.com/ipfs/go-ipfs/pull/5688))
+  - fix(cmd/gc): Run func does not return error when Emit func returns error ([ipfs/go-ipfs#5687](https://github.com/ipfs/go-ipfs/pull/5687))
 
 Extractions:
   - Extract bitswap to go-bitswap ([ipfs/go-ipfs#5294](https://github.com/ipfs/go-ipfs/pull/5294))
@@ -357,7 +363,9 @@ Testing:
   - fix(command):update `add --chunker` test ([ipfs/go-ipfs#5571](https://github.com/ipfs/go-ipfs/pull/5571))
   - switch to go 1.11 ([ipfs/go-ipfs#5483](https://github.com/ipfs/go-ipfs/pull/5483))
   - fix: sharness race in directory_size if file is removed ([ipfs/go-ipfs#5586](https://github.com/ipfs/go-ipfs/pull/5586))
+  - Bump Go versions and use '.x' to always get latest minor versions ([ipfs/go-ipfs#5682](https://github.com/ipfs/go-ipfs/pull/5682))
   - add rabin min error test ([ipfs/go-ipfs#5449](https://github.com/ipfs/go-ipfs/pull/5449))
+  - Use CircleCI 2.0 ([ipfs/go-ipfs#5691](https://github.com/ipfs/go-ipfs/pull/5691))
 
 Internal:
   - Add ability to retrieve blocks even if given using a different CID version ([ipfs/go-ipfs#5285](https://github.com/ipfs/go-ipfs/pull/5285))
@@ -378,8 +386,8 @@ Internal:
   - coreapi: PubSub API ([ipfs/go-ipfs#4805](https://github.com/ipfs/go-ipfs/pull/4805))
   - fix: maketarball.sh for OSX ([ipfs/go-ipfs#5575](https://github.com/ipfs/go-ipfs/pull/5575))
   - test the correct return value when checking directory size ([ipfs/go-ipfs#5580](https://github.com/ipfs/go-ipfs/pull/5580))
-  - downgrade iptb to a 1.3 patch release ([ipfs/go-ipfs#5596](https://github.com/ipfs/go-ipfs/pull/5596))
   - coreapi unixfs: remove Cat ([ipfs/go-ipfs#5574](https://github.com/ipfs/go-ipfs/pull/5574))
+  - Explicitally use BufferedDAG after removing Batch from importers ([ipfs/go-ipfs#5626](https://github.com/ipfs/go-ipfs/pull/5626))
 
 Cleanup:
   - Fix some weird code in core/coreunix/add.go ([ipfs/go-ipfs#5354](https://github.com/ipfs/go-ipfs/pull/5354))