RC for 4.1.14

[alexdlaird]

Added

• refresh_metrics() to NgrokTunnel.
• Documentation improvements.

[codecov]

Codecov Report

Merging #70 into master will decrease coverage by 0.69%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   95.55%   94.86%   -0.70%     
==========================================
  Files           5        5              
  Lines         495      506      +11     
==========================================
+ Hits          473      480       +7     
- Misses         22       26       +4     

Impacted Files	Coverage Δ
pyngrok/installer.py	95.90% <ø> (ø)
pyngrok/ngrok.py	92.75% <85.71%> (-1.74%)	⬇️
pyngrok/process.py	94.38% <0.00%> (-0.52%)	⬇️

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