futures: prepare to release 0.2.4 (#683)

### Fixed

- docs.rs build failures (#618)
- Spelling in documentation skins -> sinks (#643)

Co-authored-by: Eliza Weisman <[email protected]>

Author: davidbarsky

tracing-futures/CHANGELOG.md

@@ -1,3 +1,10 @@
+# 0.2.4 (April 21, 2020)
+
+### Fixed
+
+- docs.rs build failures (#618)
+- Spelling in documentation skins -> sinks (#643)
+
 # 0.2.3 (Feb 26, 2020)
 
 ### Added

tracing-futures/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tracing-futures"
-version = "0.2.3"
+version = "0.2.4"
 authors = ["Eliza Weisman <[email protected]>", "Tokio Contributors <[email protected]>"]
 edition = "2018"
 repository = "https://github.com/tokio-rs/tracing"