h2o: Update version from 2.2.0 to 2.2.2

[Changes][1]:

> ### H2O version 2.2.1 ###
>
> @kazuho kazuho released this on Apr 23 · 145 commits to master since
> this release
>
> This is a bug-fix release for 2.2 series, fixing the following issues
> found in 2.2.0.
>
> *   [mruby] correct the line number reported on an exception #1239 #1251 (Ichito Nagata)
> *   [mruby] retain the order of request headers sharing a single name #1271 (Kazuho Oku)
> *   [ssl] fix assertion failure in decode_ssl_input #1264 (Kazuho Oku)
> *   [ssl] fix OCSP stapling error when OpenSSL 1.1.0 is used #1270 (Kazuho Oku)
> *   [libh2o] fix crash when abruptly closing an HTTP/2 connection on libuv #1250 (Kazuho Oku)
> *   [libh2o] fix memory leak of _timestamp_cache #1255 (Kazuho Oku)
> *   [doc] restore doc of %{...}e #1252 (Kazuho Oku)
> *   [doc] fix typo suggesting using brotli instead of br #1263 (Bogdan Khomutsky) [misc] fix undefined behaviors detected by ubsan #1246 (Frederik Deweerdt)
>
> ### H2O version 2.2.2 ###
>
> @kazuho kazuho released this on Apr 23 · 145 commits to master since
> this release
>
> This is a bug-fix release for 2.2 series, fixing the following
> regression found in 2.2.1.
>
> *   [ssl] fix OCSP stapling error when LibreSSL is used #1275 (Ian Moone)

[1] https://github.com/h2o/h2o/releases

h2o.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION h2o-2.2.0-0
+# BEE_VERSION h2o-2.2.2-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)