Fama French data: Update regex search for finding table start to exclude comment strings

[jayvn]

Fixes crash when reading Fama-French data (US Momentum data specifically)

[codecov-io]

Codecov Report

Merging #749 into master will decrease coverage by 14.66%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #749       +/-   ##
===========================================
- Coverage   83.77%   69.11%   -14.67%     
===========================================
  Files          62       62               
  Lines        2768     2768               
  Branches      305      305               
===========================================
- Hits         2319     1913      -406     
- Misses        374      776      +402     
- Partials       75       79        +4

Impacted Files	Coverage Δ
pandas_datareader/famafrench.py	96.15% <100%> (ø)	⬆️
pandas_datareader/av/forex.py	22.72% <0%> (-72.73%)	⬇️
pandas_datareader/av/quotes.py	26.47% <0%> (-64.71%)	⬇️
pandas_datareader/quandl.py	29.26% <0%> (-63.42%)	⬇️
pandas_datareader/av/time_series.py	32.43% <0%> (-62.17%)	⬇️
pandas_datareader/enigma.py	23.63% <0%> (-60%)	⬇️
pandas_datareader/tiingo.py	38.29% <0%> (-57.45%)	⬇️
pandas_datareader/tests/test_quandl.py	42.59% <0%> (-57.41%)	⬇️
pandas_datareader/oecd.py	43.47% <0%> (-52.18%)	⬇️
pandas_datareader/tests/av/test_av_time_series.py	28.4% <0%> (-51.14%)	⬇️
... and 14 more

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[bashtage]

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