Fixed the hello world example

[microft]

Description

This fixes the hello_world.py example.

[codecov-commenter]

Codecov Report

Merging #224 (8cdefb5) into master (5077210) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
- Coverage   94.40%   94.38%   -0.02%     
==========================================
  Files         100      100              
  Lines       10740    10745       +5     
  Branches     1214     1469     +255     
==========================================
+ Hits        10139    10142       +3     
- Misses        536      537       +1     
- Partials       65       66       +1     

Impacted Files	Coverage Δ
faust/cli/base.py	98.20% <0.00%> (-0.50%)	⬇️

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