Fixed deprecated functions (bytestring, is, symbol)

[wookay]

Hello

• Fixed deprecated functions: bytestring to unsafe_string, is to===, symbol to Symbol
• Compat.ASCIIString for pgtype, pgdata
• requires DataFrames.jl v0.8.0

thanks.

[coveralls]

Coverage increased (+1.1%) to 76.682% when pulling ae714f0276c2d6f413c269594f25062db4115853 on wookay:deprecated_bytestring_is into a29b45f9d922948dc914d4cc3e34a7352fa29282 on JuliaDB:master.

[codecov-io]

Codecov Report

Merging #48 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   75.56%   75.56%           
=======================================
  Files           3        3           
  Lines         221      221           
=======================================
  Hits          167      167           
  Misses         54       54

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[coveralls]

Coverage increased (+0.8%) to 76.364% when pulling e87b3a53dce98c4f503ec469bf33f42be295a2c2 on wookay:deprecated_bytestring_is into a29b45f9d922948dc914d4cc3e34a7352fa29282 on JuliaDB:master.

[coveralls]

Coverage increased (+0.8%) to 76.364% when pulling e87b3a53dce98c4f503ec469bf33f42be295a2c2 on wookay:deprecated_bytestring_is into a29b45f9d922948dc914d4cc3e34a7352fa29282 on JuliaDB:master.

[coveralls]

Coverage increased (+0.3%) to 75.909% when pulling 4d9ea7f465d2cd1785cab20cabb1c3a65e196407 on wookay:deprecated_bytestring_is into a29b45f9d922948dc914d4cc3e34a7352fa29282 on JuliaDB:master.