fix git clone command in README

[stevegt]

No description provided.

[github-actions]

Comparing with master branch:

name                                          old time/op    new time/op    delta
RealDocumentProcessing/demo.adoc-2              18.9ms ± 5%    17.9ms ± 1%  -4.83%  (p=0.003 n=8+8)
RealDocumentProcessing/vertx-examples.adoc-2    52.0ms ± 4%    51.5ms ± 2%    ~     (p=0.481 n=10+10)
RealDocumentProcessing/mocking.adoc-2           50.8ms ± 2%    50.9ms ± 2%    ~     (p=0.739 n=10+10)

name                                          old alloc/op   new alloc/op   delta
RealDocumentProcessing/demo.adoc-2              8.85MB ± 0%    8.85MB ± 0%    ~     (p=0.353 n=10+10)
RealDocumentProcessing/vertx-examples.adoc-2    24.0MB ± 0%    24.0MB ± 0%  +0.01%  (p=0.029 n=10+10)
RealDocumentProcessing/mocking.adoc-2           21.6MB ± 0%    21.6MB ± 0%    ~     (p=0.754 n=10+10)

name                                          old allocs/op  new allocs/op  delta
RealDocumentProcessing/demo.adoc-2                106k ± 0%      106k ± 0%    ~     (p=0.982 n=10+10)
RealDocumentProcessing/vertx-examples.adoc-2      305k ± 0%      305k ± 0%    ~     (p=0.479 n=10+10)
RealDocumentProcessing/mocking.adoc-2             326k ± 0%      326k ± 0%    ~     (p=0.779 n=10+10)

Comparing with latest release:

name                                          old time/op    new time/op    delta
RealDocumentProcessing/demo.adoc-2              18.9ms ± 5%    18.9ms ± 4%    ~     (p=0.888 n=8+9)
RealDocumentProcessing/vertx-examples.adoc-2    52.0ms ± 4%    53.3ms ± 4%    ~     (p=0.105 n=10+10)
RealDocumentProcessing/mocking.adoc-2           50.8ms ± 2%    51.2ms ± 2%    ~     (p=0.053 n=10+9)

name                                          old alloc/op   new alloc/op   delta
RealDocumentProcessing/demo.adoc-2              8.85MB ± 0%    8.85MB ± 0%    ~     (p=0.853 n=10+10)
RealDocumentProcessing/vertx-examples.adoc-2    24.0MB ± 0%    24.0MB ± 0%  -0.01%  (p=0.000 n=10+9)
RealDocumentProcessing/mocking.adoc-2           21.6MB ± 0%    21.6MB ± 0%    ~     (p=0.393 n=10+10)

name                                          old allocs/op  new allocs/op  delta
RealDocumentProcessing/demo.adoc-2                106k ± 0%      106k ± 0%  -0.01%  (p=0.000 n=10+10)
RealDocumentProcessing/vertx-examples.adoc-2      305k ± 0%      305k ± 0%  -0.03%  (p=0.000 n=10+10)
RealDocumentProcessing/mocking.adoc-2             326k ± 0%      326k ± 0%  -0.00%  (p=0.002 n=10+6)

[xcoulon]

thanks for catching this error @stevegt 🙌