chore: fast RPM package count on openSUSE (libmacchina 7.1.0)

This requires the `rpm-devel` package to be installed

Cargo.toml

@@ -20,7 +20,7 @@ globset = "0.4.10"
 dotenvy = "0.15.6"
 glob = "0.3.1"
 which = "4.4.0"
-libmacchina = "7"
+libmacchina = "7.1.0"
 crossterm = "0.26.1"
 
 [profile.release]

README.md

@@ -32,6 +32,8 @@ If you want a logo to be added, feel free to open an issue or a PR.
 
 ## Installation
 
+_Note: On openSUSE, install the `rpm-devel` package for faster package count._
+
 ### Binary
 
 Download a binary from the
@@ -74,10 +76,11 @@ managers. For more info, see [Improving Performance](#imp_perf)._
 
 The by far slowest part of the `pfetch` execution time is counting the installed
 packages. For most package managers this is still very fast, but there are some
-(currently `nix` and `zypper`) that take ~500ms to report installed packages,
+(currently `nix` (and `zypper`, if `rpm-devel` is not installed)) that take
-which takes away all performance benefits of the Rust version. If you have one
+~500ms to report installed packages, which takes away all performance benefits
-or more of these installed, you can skip counting them by setting the
+of the Rust version. If you have one or more of these installed, you can skip
-`PF_FAST_PKG_COUNT` environment variable.
+counting them by setting the `PF_FAST_PKG_COUNT` environment variable to any
+value.
 
 ## Configuration