doc(changelog): changelog for releases from 2.8.0 to 2.11.0

Signed-off-by: mayank <[email protected]>

Author: mayank

CHANGELOG.md

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+v2.11.0 / 2021-07-14
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+v2.11.0-RC2 / 2021-07-12
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+v2.11.0-RC1 / 2021-07-07
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+v2.10.0 / 2021-06-14
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+v2.10.0-RC2 / 2021-06-11
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+v2.10.0-RC1 / 2021-06-08
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+v2.9.0 / 2021-05-13
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+v2.9.0-RC2 / 2021-05-10
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+v2.9.0-RC1 / 2021-05-06
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+v2.8.0 / 2021-04-14
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+v2.8.0-RC2 / 2021-04-12
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+v2.8.0-RC1 / 2021-04-07
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 v2.7.0 / 2021-03-11
 ========================
 * Fix zc_nvlist_dst buffer allocation when ioctl is ZFS_IOC_ERROR_LOG. ([#82](https://github.com/openebs/libcstor/pull/82),[@sgielen](https://github.com/sgielen))