fix tr-based search/replace with improved sed-based search-replace

old one removed all of the characters in version, wherever they were in the line,
so v0.28.0-rc.1 ended up v0.28.0-c.1

justfile

@@ -45,7 +45,7 @@ verify-clean-git:
     test "$(echo `git status --porcelain` | wc -c)" -eq "1"
 
 get-crate-version:
-    @cat Cargo.toml | rg '^version =' | tr -d "version = " | tr -d '"'
+    @cat Cargo.toml | rg '^version =' | sed -e 's/^version\s*=\s*//' | tr -d '"'
 
 # re-generate README.md and overwrite existing file with output
 update-readme: