Change Installation section of README template to numbered list#6942

Merged

sdogruyol merged 5 commits intocrystal-lang:masterfrom wooster0:123yaml

Oct 18, 2018

+8-9

Commits on Oct 13, 2018

Change Installation section to numbered list
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Fix specs
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Commits on Oct 15, 2018

Improve step 2
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Commits on Oct 17, 2018

Remove step 1
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shards -> shards install
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