fix: spelling mistake in readme

[tjg184]

Simple spelling mistake that I couldn't find an issue for.

[codecov]

Codecov Report

Merging #1854 (aa23275) into master (4989f44) will increase coverage by 1.43%.
The diff coverage is 65.18%.

@@            Coverage Diff             @@
##           master    #1854      +/-   ##
==========================================
+ Coverage   61.22%   62.66%   +1.43%     
==========================================
  Files          46       51       +5     
  Lines        7141     8193    +1052     
==========================================
+ Hits         4372     5134     +762     
- Misses       2462     2672     +210     
- Partials      307      387      +80     

Impacted Files	Coverage Δ
pkg/common/outbound_ip.go	0.00% <0.00%> (ø)
pkg/container/docker_cli.go	82.23% <ø> (ø)
pkg/container/docker_logger.go	52.08% <ø> (ø)
pkg/container/docker_run.go	13.58% <0.00%> (-0.01%)	⬇️
pkg/container/docker_volume.go	0.00% <ø> (ø)
pkg/container/file_collector.go	39.68% <0.00%> (+2.38%)	⬆️
pkg/container/host_environment.go	0.00% <0.00%> (ø)
...ontainer/linux_container_environment_extensions.go	23.07% <0.00%> (-1.25%)	⬇️
pkg/exprparser/functions.go	66.32% <0.00%> (-1.04%)	⬇️
pkg/model/workflow.go	42.33% <8.88%> (+0.21%)	⬆️
... and 26 more

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