Httpj

- Add the `trust_env` property to `BaseClient`. (Pull 187)
- Add the `links` property to `BaseResponse`. (Pull 211)
- Accept `ssl.SSLContext` instances into `SSLConfig(verify=...)`. (Pull 215)
- Add `Response.stream_text()` with incremental encoding detection. (Pull 183)
- Properly updated the `Host` header when a redirect changes the origin. (Pull 199)
- Ignore invalid `Content-Encoding` headers. (Pull 196)
- Use `~/.netrc` and `~/_netrc` files by default when `trust_env=True`. (Pull 189)
- Create exception base class `HTTPError` with `request` and `response` properties. (Pull 162)
- Add HSTS preload list checking within `BaseClient` to upgrade HTTP URLs to HTTPS. (Pull 184)
- Switch IDNA encoding from IDNA 2003 to IDNA 2008. (Pull 161)
- Expose base classes for alternate concurrency backends. (Pull 178)
- Improve Multipart parameter encoding. (Pull 167)
- Add the `headers` property to `BaseClient`. (Pull 159)
- Add support for Google's `brotli` library. (Pull 156)
- Remove deprecated TLS versions (TLSv1 and TLSv1.1) from default `SSLConfig`. (Pull 155)
- Fix `URL.join(...)` to work similarly to RFC 3986 URL joining. (Pull 144)

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- Check for disconnections when searching for an available
connection in `ConnectionPool.keepalive_connections` (Pull 145)
- Allow string comparison for `URL` objects (Pull 139)
- Add HTTP status codes 418 and 451 (Pull 135)
- Add support for client certificate passwords (Pull 118)
- Enable post-handshake client cert authentication for TLSv1.3 (Pull 118)
- Disable using `commonName` for hostname checking for OpenSSL 1.1.0+ (Pull 118)
- Detect encoding for `Response.json()` (Pull 116)

- Check for connection aliveness on re-acquiry (Pull 111)

- Improve `USER_AGENT` (Pull 110)
- Add `Connection: keep-alive` by default to HTTP/1.1 connections. (Pull 110)

- Include `Host` header by default. (Pull 109)
- Improve HTTP protocol detection. (Pull 107)

- Implement read and write timeouts (Pull 104)