README+root: bump version to v0.12.0

Author: guggero

README.md

@@ -30,7 +30,7 @@ Example (make sure you always use the latest version!):
 
 ```shell
 $ cd /tmp
-$ wget -O chantools.tar.gz https://github.com/lightninglabs/chantools/releases/download/v0.11.3/chantools-linux-amd64-v0.11.3.tar.gz
+$ wget -O chantools.tar.gz https://github.com/lightninglabs/chantools/releases/download/v0.12.0/chantools-linux-amd64-v0.12.0.tar.gz
 $ tar -zxvf chantools.tar.gz
 $ sudo mv chantools-*/chantools /usr/local/bin/
 ```
@@ -384,7 +384,7 @@ $    export AEZEED_MNEMONIC="abandon able ... ... ..."
 $    export AEZEED_PASSPHRASE="-"
 $ chantools showrootkey
 
-2020-10-29 20:22:42.329 [INF] CHAN: chantools version v0.6.0 commit v0.6.0-3
+2020-10-29 20:22:42.329 [INF] CHAN: chantools version v0.12.0 commit v0.12.0
 
 Your BIP32 HD root key is: xprv9s21ZrQH1...
 ```

cmd/chantools/root.go

@@ -31,7 +31,7 @@ const (
 	// version is the current version of the tool. It is set during build.
 	// NOTE: When changing this, please also update the version in the
 	// download link shown in the README.
-	version = "0.11.3"
+	version = "0.12.0"
 	na      = "n/a"
 
 	// lndVersion is the current version of lnd that we support. This is