Upgrade Version To 1.0.8

[NihalHarish]

Description of changes:

• bump version to 1.0.8

Style and formatting:

I have run pre-commit install to ensure that auto-formatting happens with every commit.

Issue number, if available

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-io]

Codecov Report

Merging #469 (aa2fcae) into master (b45b20f) will decrease coverage by 15.37%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #469       +/-   ##
===========================================
- Coverage   65.55%   50.18%   -15.38%     
===========================================
  Files         173      163       -10     
  Lines       13275    12929      -346     
===========================================
- Hits         8702     6488     -2214     
- Misses       4573     6441     +1868     

Impacted Files	Coverage Δ
smdebug/_version.py	100.00% <100.00%> (ø)
smdebug/tensorflow/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
smdebug/tensorflow/constants.py	0.00% <0.00%> (-100.00%)	⬇️
smdebug/tensorflow/singleton_utils.py	0.00% <0.00%> (-100.00%)	⬇️
smdebug/tensorflow/collection.py	0.00% <0.00%> (-95.88%)	⬇️
smdebug/tensorflow/session.py	0.00% <0.00%> (-91.83%)	⬇️
smdebug/tensorflow/keras.py	0.00% <0.00%> (-89.30%)	⬇️
smdebug/tensorflow/tensor_ref.py	0.00% <0.00%> (-88.71%)	⬇️
smdebug/tensorflow/utils.py	0.00% <0.00%> (-86.26%)	⬇️
smdebug/tensorflow/callable_cache.py	0.00% <0.00%> (-84.79%)	⬇️
... and 54 more

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