Fix Parser panic when runner reports cpu

[piotrekmonko]

Some Github runners report, in addition to and after pkg: line, also the CPU name on which the benchmarks are run which results in a panic which this proposed PR fixes:

panic: cpu: Intel(R) Xeon(R) Platinum 8275CL CPU @ 3.00GHz: could not parse run: strconv.Atoi: parsing "": invalid syntax (line: cpu: Intel(R) Xeon(R) Platinum 8275CL CPU @ 3.00GHz)

[piotrekmonko]

This fixes issue #47

[bobheadxi]

Very clean, thank you!

[bobheadxi]

Closes #48

[codecov]

Codecov Report

Merging #49 (56788e6) into master (45436a7) will decrease coverage by 1.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   32.65%   31.30%   -1.34%     
==========================================
  Files           8        8              
  Lines         481      441      -40     
==========================================
- Hits          157      138      -19     
+ Misses        306      285      -21     
  Partials       18       18              

Impacted Files	Coverage Δ
bench/parser.go	63.24% <100.00%> (+0.57%)	⬆️
checks/config.go	59.10% <0.00%> (-2.44%)	⬇️
io.go	9.90% <0.00%> (-1.99%)	⬇️
checks/evaluate.go	69.39% <0.00%> (-0.98%)	⬇️
main.go	0.00% <0.00%> (ø)
merge.go	0.00% <0.00%> (ø)
checks/generate.go	0.00% <0.00%> (ø)
bench/benchmark.go	50.00% <0.00%> (+7.15%)	⬆️

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