Tokenizer: Fix line continuation after punctuation

Prior to this change, any line ending with [punctuation + '...'], for
example `||...`, would cause the tokenizer to fail.

tokenize_code.m

@@ -99,6 +99,12 @@
             % any other operator:
             else
                 symbol = skip(punctuation);
+                % ends with '...'
+                if length(symbol) > 3 && endsWith(symbol, '...')
+                    % unskip '...'
+                    pos = pos - 3;
+                    symbol = symbol(1:end-3);
+                end
                 % one operator:
                 if any(strcmp(symbol, operators))
                     add_token('punctuation', symbol);