print space normally in Debug for Bytes (#155)

src/debug.rs

@@ -27,8 +27,8 @@ impl<'a> fmt::Debug for BsDebug<'a> {
                 try!(write!(fmt, "\\{}", c as char));
             } else if c == b'\0' {
                 try!(write!(fmt, "\\0"));
-            // ASCII printable except space
-            } else if c > 0x20 && c < 0x7f {
+            // ASCII printable
+            } else if c >= 0x20 && c < 0x7f {
                 try!(write!(fmt, "{}", c as char));
             } else {
                 try!(write!(fmt, "\\x{:02x}", c));

tests/test_debug.rs

@@ -11,7 +11,7 @@ fn fmt() {
         \\x08\\t\\n\\x0b\\x0c\\r\\x0e\\x0f\
         \\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\
         \\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f\
-        \\x20!\\\"#$%&'()*+,-./0123456789:;<=>?\
+        \x20!\\\"#$%&'()*+,-./0123456789:;<=>?\
         @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_\
         `abcdefghijklmnopqrstuvwxyz{|}~\\x7f\
         \\x80\\x81\\x82\\x83\\x84\\x85\\x86\\x87\