Fix syntax

Author: DilumAluthge

src/Compat.jl

@@ -1312,7 +1312,7 @@ end
 
     Base.isless(a::SHA256, b::SHA256) = isless(a.bytes, b.bytes)
     Base.hash(a::SHA256, h::UInt) = hash((SHA256, a.bytes), h)
-    Base.==(a::SHA256, b::SHA256) = a.bytes == b.bytes
+    Base.:(==)(a::SHA256, b::SHA256) = a.bytes == b.bytes
 end
 
 include("deprecated.jl")