Update README.md

[profcamseo]

corrected git clone link

[google-cla[bot]]

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[JackHowa]

not sure, seems ok to be ... personal preference? can close

 git clone git@github.com:GoogleChromeLabs/estimator.dev.git

Cloning into 'estimator.dev'...
remote: Enumerating objects: 69, done.
remote: Counting objects: 100% (69/69), done.
remote: Compressing objects: 100% (55/55), done.
remote: Total 69 (delta 28), reused 41 (delta 13), pack-reused 0
Receiving objects: 100% (69/69), 37.33 KiB | 3.39 MiB/s, done.
Resolving deltas: 100% (28/28), done.