v2.3.0

What's Changed

• Start 2.3 development by @takayukister in #12
• Use wp_rand() in coding example by @takayukister in #13
• Prepare for 2.3 release by @takayukister in #15

Full Changelog: v2.2.0...v2.3.0

Really Simple CAPTCHA 2.2

Merge pull request #10 from rocklobster-in/dev/2.2

Prepare for 2.2 release