Add mysqldb/pymysql wrappers

[kolanos]

Closes #345

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@58f1969). Click here to learn what that means.
The diff coverage is 98.85%.

@@            Coverage Diff            @@
##             master     #351   +/-   ##
=========================================
  Coverage          ?   86.41%           
=========================================
  Files             ?       39           
  Lines             ?     1656           
  Branches          ?        0           
=========================================
  Hits              ?     1431           
  Misses            ?      225           
  Partials          ?        0

Impacted Files	Coverage Δ
iopipe/contrib/trace/auto_db.py	94.08% <100%> (ø)
iopipe/contrib/trace/dbapi.py	93.33% <80%> (ø)

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[mrickard]

👍