Fix mix-up in the parser

>= and > had gotten mixed up and were being parsed as each other. This
is fixed.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/parser.rs

@@ -208,9 +208,9 @@ impl Lexer {
             }
         } else if self.mat('>') {
             if self.mat('=') {
-                return Ok(self.make_token(TokenKind::Greater));
-            } else {
                 return Ok(self.make_token(TokenKind::GreaterEq));
+            } else {
+                return Ok(self.make_token(TokenKind::Greater));
             }
         } else if self.mat('(') {
             self.paren_stack.push(')');