Update CHANGELOG

CHANGELOG.md

@@ -1,3 +1,33 @@
+Unreleased
+----------
+
+- Add `IPAddr#to_json/as_json` [\#77](https://github.com/ruby/ipaddr/pull/77) ([taketo1113](https://github.com/taketo1113))
+- Consider IPv4-mapped IPv6 addresses link local/loopback if IPV4 address is private [\#65](https://github.com/ruby/ipaddr/pull/65) ([Earlopain](https://github.com/Earlopain))
+- Fix broken exception messages [\#64](https://github.com/ruby/ipaddr/pull/64) ([lrandall-godaddy](https://github.com/lrandall-godaddy))
+- ntop: Measure address size in bytes [\#61](https://github.com/ruby/ipaddr/pull/61) ([hanazuki](https://github.com/hanazuki))
+- String\#split seems to be faster than capturing digits with Regexp [\#50](https://github.com/ruby/ipaddr/pull/50) ([amatsuda](https://github.com/amatsuda))
+- Prefer String\#start\_with? over Regexp.match [\#49](https://github.com/ruby/ipaddr/pull/49) ([amatsuda](https://github.com/amatsuda))
+- Add IPAddr\#wildcard\_mask [\#44](https://github.com/ruby/ipaddr/pull/44) ([taketo1113](https://github.com/taketo1113))
+- Add IPAddr.cidr to return ip address in cidr notation [\#23](https://github.com/ruby/ipaddr/pull/23) ([beanieboi](https://github.com/beanieboi))
+
+1.2.6
+-----
+
+- Consider IPv4-mapped IPv6 addresses private if IPv4 address is private [\#57](https://github.com/ruby/ipaddr/pull/57) ([jeremyevans](https://github.com/jeremyevans))
+- Improve performance of include? by 5-10x [\#47](https://github.com/ruby/ipaddr/pull/47) ([skipkayhil](https://github.com/skipkayhil))
+
+1.2.5
+-----
+
+- No user-visible changes for gem users
+
+1.2.4
+-----
+
+- Fix exception calling `to_range' after `freeze' - fix \#35 [\#36](https://github.com/ruby/ipaddr/pull/36) ([esparta](https://github.com/esparta))
+- IPAddr\#native must also coerce `@mask_addr` [\#34](https://github.com/ruby/ipaddr/pull/34) ([casperisfine](https://github.com/casperisfine))
+- Expose IPAddr::VERSION [\#33](https://github.com/ruby/ipaddr/pull/33) ([casperisfine](https://github.com/casperisfine))
+
 1.2.3
 -----