release: v0.2.2

CHANGELOG:
- feat(capset): add issubset() and issuperset() methods
- refactor(caps): special-case full CapState
- refactor(caps): avoid excessive writes in CapState Display impl
- feat(prctl): add speculation control interface
- feat(prctl): add perf events and I/O flusher interfaces
- doc: Improve documentation

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "capctl"
-version = "0.2.1"
+version = "0.2.2"
 edition = "2018"
 
 description = "A pure-Rust interface to prctl() and Linux capabilities."