Fix README make instruction typos

[orbitalturtle]

A couple tricky little typos that had me confused today heh

[codecov]

Codecov Report

Patch coverage: 26.31% and project coverage change: -2.56% ⚠️

Comparison is base (25981de) 61.25% compared to head (42eacec) 58.69%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   61.25%   58.69%   -2.56%     
==========================================
  Files           5        5              
  Lines         924      983      +59     
==========================================
+ Hits          566      577      +11     
- Misses        358      406      +48     

Files Changed	Coverage Δ
src/lnd.rs	0.00% <0.00%> (ø)
src/main.rs	0.00% <0.00%> (-2.00%)	⬇️
src/onion_messenger.rs	62.73% <47.61%> (-0.76%)	⬇️

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[carlaKC]

Not sure what's going on with codecov here - false negative since we're only touching readme.

[orbitalturtle]

@carlaKC Strange indeed. I'll add an issue and maybe take a look sometime this week