Fixing some dependency issues due to some pip updates

[hunterhector]

This PR tries to resolve the recent dependency issues.

Description of changes

Updates a few package dependencies, such as bumping AllenNLP to 1.1.0, and relaxing the requirements on pytorch.

Currently installing the bleeding-edge pip to avoid the huge list of downloads in pip 20.3 (pypa/pip#9215)

Possible influences of this PR.

Not sure whether these dependency changes will cause problems in the other part of the code base. There should not be significant problems if we pass the test.

Test Conducted

Describe what test cases are included for the PR.

[codecov]

Codecov Report

Merging #325 (ec45dda) into master (66462e7) will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   79.81%   79.81%           
=======================================
  Files         154      154           
  Lines        9919     9919           
=======================================
  Hits         7917     7917           
  Misses       2002     2002           

Impacted Files	Coverage Δ
forte/data/ontology/core.py	78.05% <0.00%> (ø)
forte/data/ontology/utils.py	65.15% <ø> (ø)
forte/models/srl/model.py	14.63% <0.00%> (ø)
forte/processors/base/batch_processor.py	85.34% <ø> (ø)
forte/processors/vocabulary_processor.py	28.57% <0.00%> (ø)
forte/data/ontology/ontology_code_generator.py	90.23% <50.00%> (ø)
forte/data/batchers.py	77.31% <100.00%> (ø)
forte/data/ontology/code_generation_objects.py	94.84% <100.00%> (ø)
forte/data/ontology/top.py	85.71% <100.00%> (ø)
forte/models/srl/model_utils.py	24.88% <100.00%> (ø)
... and 3 more

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