Tweak README

README.md

@@ -2,20 +2,20 @@ num: 128-bit signed and unsigned integers for Go
 ================================================
 
 > [!WARNING]
-> This repo has moved to sourcehut (https://git.sr.ht/~shabbyrobe/go-num). This
-> version will remain here for the time being but may be removed at a later date. You
-> may also consider https://pkg.go.dev/lukechampine.com/uint128 for your use case as
-> I am unlikely to spend much time on this in future unless a serious bug is found.
+> This repo has moved to sourcehut (https://git.sr.ht/~shabbyrobe/go-num), and has
+> also been placed into **maintenance mode**. This version will remain here for the
+> time being but may be removed at a later date. You may also consider
+> https://pkg.go.dev/lukechampine.com/uint128 for your use case as I am unlikely to
+> spend much time on this in future unless a serious bug is found.
 
 ---
 
 Fastish `int128` (`num.I128`) and `uint128` (`num.U128`) 128-bit integer types
 for Go, providing the majority of methods found in `big.Int`.
 
-> [!WARNING]
-> Function execution times in this library _almost always_ depend on the
-> inputs. This library is inappropriate for use in any domain where it is important
-> that the execution time does not reveal details about the inputs used.
+**WARNING**: Function execution times in this library _almost always_ depend on the
+inputs. This library is inappropriate for use in any domain where it is important
+that the execution time does not reveal details about the inputs used.
 
 `I128` is a signed "two's complement" implementation that should behave the
 same way on overflow as `int64`.