Don't attempt to open output of pep next in browser

[hugovk]

For some reason, this never happened to me on macOS even though I was initially expecting it.

But it does occur on Linux:

pep next opens file:///home/username/python/main/Next%20available%20PEP:%20731 URL in a browser. This URL doesn't exist.

Don't attempt to open such output.

[codecov]

Codecov Report

Merging #50 (589bda3) into main (eb1cf0f) will decrease coverage by 0.86%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              main      #50      +/-   ##
===========================================
- Coverage   100.00%   99.14%   -0.86%     
===========================================
  Files            4        4              
  Lines          230      233       +3     
===========================================
+ Hits           230      231       +1     
- Misses           0        2       +2     

Flag	Coverage Δ
macos-latest	99.14% <100.00%> (-0.86%)	⬇️
ubuntu-latest	99.14% <100.00%> (-0.86%)	⬇️
windows-latest	99.14% <100.00%> (-0.86%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/pepotron/__init__.py	98.07% <100.00%> (-1.93%)	⬇️

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