This is a bug-fix release of 2.0 series, fixing following issues found in 2.0.1.

• [fastcgi] setenv should displace HTTP headers #996 (Kazuho Oku)
• [http2] fix buffer overrun #972 (Frederik Deweerdt)
• [misc] fix build error when libuv is not found #1008 (nextgenthemes)
• [misc] fix assertion failure when YAML alias and merge is used in certain way #1011 (Kazuho Oku)