Update status of Workspace Symbols in README

Author: benlangmuir

README.md

@@ -115,7 +115,7 @@ SourceKit-LSP is still in early development, so you may run into rough edges wit
 | Jump to Definition | ✅ | |
 | Find References | ✅ | |
 | Background Indexing | ❌ | Build project to update the index using [Indexing While Building](#indexing-while-building) |
-| Workspace Symbols | ❌ | |
+| Workspace Symbols | ✅ | |
 | Refactoring | ❌ | |
 | Formatting | ❌ | |
 | Folding | ✅ | |