Release notes for 5.8 (#1111)

docs/_pages/releases.md

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+## 5.8.0
+
+**What's New**
+* Added thread-safety to tests using `AssertionScope` while running many `async` tests concurrently - [#1091](https://github.com/fluentassertions/fluentassertions/pull/1091)
+* Allow users to specify a custom `IAssertionStrategy` for the assertion scope, for instance, to create screenshots when a test fails - [#1094](https://github.com/fluentassertions/fluentassertions/pull/1094) & [#906](https://github.com/fluentassertions/fluentassertions/issues/906). 
+* Supports .NET Core 3.0 Preview 7 - [#1107](https://github.com/fluentassertions/fluentassertions/pull/1107)
+
+**Fixes**
+* `Excluding` with `BeEquivalentTo` did not always work well with overridden properties - [#1087](https://github.com/fluentassertions/fluentassertions/pull/1087) & [#1077](https://github.com/fluentassertions/fluentassertions/issues/1077)
+* Failure message formatting threw a `FormatException` when a nested message contains braces - [#1092](https://github.com/fluentassertions/fluentassertions/pull/1092)
+* Fixed confusing `(Not)BeAssignableTo` failure messages - [#1104](https://github.com/fluentassertions/fluentassertions/pull/1104) & [#1103](https://github.com/fluentassertions/fluentassertions/issues/1103)
+* Fixed a potential leakage of failure messages between multiple assertions - [#1105](https://github.com/fluentassertions/fluentassertions/pull/1105)
+
+Kudos to [conklinb](https://github.com/conklinb) and [Amaury Levé](https://github.com/Evangelink) for notable contributions and my partner-in-crime [Jonas Nyrup](https://github.com/jnyrup) for some of the fixes, a lot of (internal) quality improvements and his critical eye. 
+
 ## 5.7.0
 
 **What's New**