up zippy dep

pixie.nimble

@@ -8,7 +8,7 @@ srcDir = "src"
 requires "nim >= 1.2.6"
 requires "vmath >= 1.0.8"
 requires "chroma >= 0.2.5"
-requires "zippy >= 0.3.5"
+requires "zippy >= 0.5.12"
 requires "flatty >= 0.1.3"
 requires "nimsimd >= 1.0.0"
 requires "bumpy >= 1.0.3"

src/pixie/fileformats/gif.nim

@@ -113,7 +113,7 @@ proc decodeGif*(data: string): Image =
         if bs.pos + bitSize.int > bs.data.len * 8: failInvalid()
         var
           # Read variable bits out of the table.
-          codeId = bs.readBits(bitSize.int).int
+          codeId = bs.readBits(bitSize).int
           # Some time we need to carry over table information.
           carryOver: seq[int]