v1.1.6

MbedTLS v1.1.6

Diff since v1.1.5

Closed issues:

• ssl_unsafe_read requires isreadable(::SSLContext) (#188)

Merged pull requests:

• Use Base.IOError more consistently for read/write operation failures (#257) (@quinnj)
• Update readme badges and bump patch version (#258) (@ararslan)