Add a new isopen(conn) function to allow checking if a connection is …

[quinnj]

…still alive

[codecov-io]

Codecov Report

Merging #145 into master will increase coverage by 0.15%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage   62.53%   62.68%   +0.15%     
==========================================
  Files           9        9              
  Lines         742      745       +3     
==========================================
+ Hits          464      467       +3     
  Misses        278      278

Impacted Files	Coverage Δ
src/api/capi.jl	26.54% <100%> (+0.65%)	⬆️
src/MySQL.jl	62.06% <50%> (-0.22%)	⬇️
src/api/ccalls.jl	5.66% <0%> (+0.94%)	⬆️

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