start, bump markup to 0.15 (#417)

Author: ParkMyCar

compact_str/Cargo.toml

@@ -35,7 +35,7 @@ arbitrary = { version = "1", optional = true, default-features = false }
 borsh = { version = "1", optional = true }
 bytes = { version = "1", optional = true }
 diesel = { version = "2", optional = true, default-features = false }
-markup = { version = "0.13", optional = true, default-features = false }
+markup = { version = "0.15", optional = true, default-features = false }
 proptest = { version = "1", optional = true, default-features = false, features = ["std"] }
 quickcheck = { version = "1", optional = true, default-features = false }
 rkyv = { version = "0.8", optional = true, default-features = false }