Fix deprecation warning regarding invalid escape sequences.

[tirkarthi]

Description

Fix deprecation warning regarding invalid escape sequences in Python 3.7 . Fix done using https://github.com/asottile/pyupgrade

find . -iname '*.py' | grep -Ev 'example|utl|samples|deps' | xargs -P 4 -I{} python3.8 -Wall -m py_compile {} 
./tasks.py:51: DeprecationWarning: invalid escape sequence \g
  '\g<option>' if active else '', cmd)
./cli_helpers/tabular_output/output_formatter.py:124: DeprecationWarning: invalid escape sequence \*
  """Format the headers and data using a specific formatter.
./cli_helpers/tabular_output/output_formatter.py:182: DeprecationWarning: invalid escape sequence \*
  """Format output using *format_name*.
./cli_helpers/utils.py:58: DeprecationWarning: invalid escape sequence \[
  _ansi_re = re.compile('\033\[((?:\d|;)*)([a-zA-Z])')
./cli_helpers/config.py:194: DeprecationWarning: invalid escape sequence \<
  """Returns the config folder for the application.  The default behavior

Checklist

• [ ] I've added this contribution to the CHANGELOG.
• [x] I've added my name to the AUTHORS file (or it's already there).

[codecov[bot]]

Codecov Report

Merging #59 into master will increase coverage by 1.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   97.16%   98.25%   +1.09%     
==========================================
  Files          12       12              
  Lines         458      458              
==========================================
+ Hits          445      450       +5     
+ Misses         13        8       -5     

Impacted Files	Coverage Δ
cli_helpers/config.py	100.00% <ø> (+4.50%)	:arrow_up:
cli_helpers/tabular_output/output_formatter.py	100.00% <ø> (ø)
cli_helpers/utils.py	100.00% <100.00%> (ø)

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[amjith]

Thank you for the PR.

:beach_umbrella: