Tweak fetch_text to get initial revisions

[adamwight]

Retrieves the articles' initial revision rather than the latest. Doesn't follow initial revisions which contain a redirect, skips these instead.

I was able to run this and verify the output, at ores-staging-01.eqiad.wmflabs:/srv/home/awight/drafttopic

wc -l
     93455 datasets/enwiki.labeled_wikiprojects.json
     84481 datasets/enwiki.labeled_wikiprojects.w_text.json

Bug: T193834

[codecov[bot]]

Codecov Report

Merging #23 into master will decrease coverage by 6.85%. The diff coverage is 3.44%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   53.37%   46.52%   -6.86%     
==========================================
  Files          17       16       -1     
  Lines         755      733      -22     
==========================================
- Hits          403      341      -62     
- Misses        352      392      +40

Impacted Files	Coverage Δ
drafttopic/feature_lists/wordvectors.py	0% <ø> (ø)	:arrow_up:
drafttopic/utilities/fetch_text.py	0% <0%> (-59.75%)	:arrow_down:
drafttopic/utilities/wikiprojects_common.py	57.14% <100%> (ø)	:arrow_up:

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[halfak]

Just a couple of notes. Otherwise looks good to me.