Update to Crystal 0.20.0

Author: ggiraldez

shard.yml

@@ -1,5 +1,5 @@
 name: redis
-version: 0.3.0
+version: 0.4.0
 
 authors:
   - Ary Borenszweig <[email protected]>

spec/redis/protocol_spec.cr

@@ -2,7 +2,7 @@ require "../spec_helper"
 
 def it_reads(string, expected, file = __FILE__, line = __LINE__)
   it "reads #{string}", file, line do
-    Redis::Protocol.read(MemoryIO.new(string)).should eq(expected)
+    Redis::Protocol.read(IO::Memory.new(string)).should eq(expected)
   end
 end
 
@@ -27,32 +27,32 @@ describe Redis::Protocol do
 
     it "raises CommandError on error" do
       expect_raises Redis::CommandError, "OH NO!" do
-        Redis::Protocol.read(MemoryIO.new("-OH NO!"))
+        Redis::Protocol.read(IO::Memory.new("-OH NO!"))
       end
     end
   end
 
   describe "write" do
     it "writes nil" do
-      io = MemoryIO.new
+      io = IO::Memory.new
       Redis::Protocol.write(nil, io)
       io.to_s.should eq("$-1\r\n")
     end
 
     it "writes bulk string" do
-      io = MemoryIO.new
+      io = IO::Memory.new
       Redis::Protocol.write("hello", io)
       io.to_s.should eq("$5\r\nhello\r\n")
     end
 
     it "writes integer" do
-      io = MemoryIO.new
+      io = IO::Memory.new
       Redis::Protocol.write(1234, io)
       io.to_s.should eq(":1234\r\n")
     end
 
     it "writes array" do
-      io = MemoryIO.new
+      io = IO::Memory.new
       Redis::Protocol.array(5, io) do
         Redis::Protocol.write(1, io)
         Redis::Protocol.write(2, io)

src/protocol.cr

@@ -62,7 +62,7 @@ module Redis
         negative = true
         char = read_char(io)
       end
-      while char.digit?
+      while char.ascii_number?
         length = length * 10 + (char - '0')
         char = read_char(io)
       end