Llhttp

Minor changes (breaking bugfixes):

* 374434d6106dd8d3a00b65facac3b44fae913683 - http: PRI upgrade should return PAUSED_H2_UPGRADE

Breaking changes:

* cc5adf399c116638cf1e07f937a67864149fb419 - api: introduce `llhttp_set_lenient_keep_alive`

Feature changes:

* a620012f3fd1b64ace16d31c52cd57b97ee7174c - src: wasm build support

Fixes:

- dc4316a - fix Content-Length handling on 32bit platforms

Minor changes (breaking bugfixes):

* 374434d6106dd8d3a00b65facac3b44fae913683 - http: PRI upgrade should return PAUSED_H2_UPGRADE

Major changes:

- 73d7bd9bb0447c6e6684708f28b79ee87e280d01 - http: recognize HTTP2/PRI upgrade
- 9ed669be4a12bc40f7ff7d638c77500c13bde2ae - api: add llhttp_reset
- aa07189d39b8d0da9d5a887d93761014a45804bf - makefile: build & install shared library (84)
- e9b36ea64709c35ca66094d5cf3787f444029601 - http: unset `F_CHUNKED` on new `Transfer-Encoding` (CVE-2020-8287)

Major changes:

- 91d595cab8d2c664695e752fa86f742511b55f22 - http: unset `F_CHUNKED` on new `Transfer-Encoding` (CVE-2020-8287)