fix: replace sed with vgrep (#238)

CHANGELOG.md

@@ -1,5 +1,9 @@
 # 🎀 Changelog
 
+## Unreleased
+### Fixed
+- Replaced `sed` in-place editing with `grep` and `mv` for compatibility with BSD utils
+
 ## [2.1.0] - 2022-02-10
 ### Added
 - Documented custom userdata types (Job and Timer Objects)

Taskfile.yaml

@@ -34,4 +34,4 @@ tasks:
       - rm -vrf
         "{{.DESTDIR}}{{.BINDIR}}/hilbish"
         "{{.DESTDIR}}{{.LIBDIR}}"
-      - sed -i '/hilbish/d' /etc/shells
+      - grep -v 'hilbish' /etc/shells > /tmp/shells.hilbish_uninstall && mv /tmp/shells.hilbish_uninstall /etc/shells