spawn obstacles automatically

[pinussilvestrus]

Closes #34

• spawn obstacles automatically in the beginning
• variable sizes
• consider refactor the respawning

[codecov]

Codecov Report

Merging #39 into master will increase coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #39     +/-   ##
=========================================
+ Coverage   98.42%   98.52%   +0.1%     
=========================================
  Files           6        6             
  Lines         190      204     +14     
=========================================
+ Hits          187      201     +14     
  Misses          3        3

Impacted Files	Coverage Δ
lib/obstacle/obstacle.js	100% <100%> (ø)	⬆️
lib/canvas/canvas.js	100% <100%> (ø)	⬆️
lib/main/main.js	92.5% <100%> (+0.6%)	⬆️

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[pinussilvestrus]

[pinussilvestrus]

One think we should consider is to replace the respawning of the obstacled with deleting them from the shapes array and just create a new one (delete the if clause). What do you think @Langleu ?