doc(changelog): changelog for releases from v2.4.0 to v2.11.0

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
+========================
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+v2.7.0-RC2 / 2021-03-10
+========================
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+v2.7.0-RC1 / 2021-03-08
+========================
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+v2.6.0 / 2021-02-13
+========================
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+v2.6.0-RC2 / 2021-02-11
+========================
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+v2.6.0-RC1 / 2021-02-08
+========================
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+v2.5.0 / 2021-01-12
+========================
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+v2.5.0-RC2 / 2021-01-11
+========================
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+v2.5.0-RC1 / 2021-01-08
+========================
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+v2.4.1 / 2020-12-18
+========================
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+v2.4.0 / 2020-12-13
+========================
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+v2.4.0-RC2 / 2020-12-12
+========================
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+v2.4.0-RC1 / 2020-12-10
+========================
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 v2.3.0 / 2020-11-14
 ========================
 * chore(build): add support for multiarch build ([#346](https://github.com/openebs/istgt/pull/346),[@shubham14bajpai](https://github.com/shubham14bajpai))