Print concurrency at beginning of SQL validator

[DylanBaker]

closes #148

[codecov]

Codecov Report

Merging #171 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #171   +/-   ##
=======================================
  Coverage   69.92%   69.92%           
=======================================
  Files          10       10           
  Lines         788      788           
=======================================
  Hits          551      551           
  Misses        237      237           

Impacted Files	Coverage Δ
spectacles/validators.py	58.87% <ø> (ø)

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