Update NIOSSH version in README (apple#1783)

Motivation:

SwiftNIO SSH has a 0.2.0 release now.

Modifications:

- Update suggested version in README

Result:

README is more up-to-date

README.md

@@ -18,7 +18,7 @@ Repository | NIO 2 (Swift 5+) | NIO 1 (Swift 4+)
 [https://github.com/apple/swift-nio-http2][repo-nio-http2]<br> HTTP/2 support | `from: "1.0.0"` | `from: "0.1.0"`
 [https://github.com/apple/swift-nio-extras][repo-nio-extras] <br>useful additions around SwiftNIO | `from: "1.0.0"` | `from: "0.1.0"`
 [https://github.com/apple/swift-nio-transport-services][repo-nio-transport-services] <br> first-class support for macOS, iOS, tvOS, and watchOS | `from: "1.0.0"` | `from: "0.1.0"`
-[https://github.com/apple/swift-nio-ssh][repo-nio-ssh] <br> SSH support | `.upToNextMinor(from: "0.1.0")` | _n/a_
+[https://github.com/apple/swift-nio-ssh][repo-nio-ssh] <br> SSH support | `.upToNextMinor(from: "0.2.0")` | _n/a_
 
 ### Protocol Implementations