Clean up README

[int-y1]

[dmoj-build]

Can one of the admins verify this patch?

[codecov-commenter]

Codecov Report

Merging #1037 (d0fb666) into master (12b42f6) will increase coverage by 2.94%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1037      +/-   ##
==========================================
+ Coverage   81.12%   84.07%   +2.94%     
==========================================
  Files         140      140              
  Lines        4790     4790              
==========================================
+ Hits         3886     4027     +141     
+ Misses        904      763     -141     

Impacted Files	Coverage Δ
dmoj/judge.py	53.98% <0.00%> (+1.22%)	:arrow_up:
dmoj/executors/java_executor.py	85.35% <0.00%> (+2.02%)	:arrow_up:
dmoj/cptbox/compiler_isolate.py	55.31% <0.00%> (+6.38%)	:arrow_up:
dmoj/cptbox/tracer.py	76.32% <0.00%> (+18.02%)	:arrow_up:
dmoj/cptbox/handlers.py	100.00% <0.00%> (+26.31%)	:arrow_up:
dmoj/cptbox/isolate.py	89.63% <0.00%> (+38.41%)	:arrow_up:
dmoj/control.py	100.00% <0.00%> (+64.70%)	:arrow_up:

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[kiritofeng]

ok to test