Forgot to add testtrue check

uncompyle6/parsers/reducecheck/testtrue.py

@@ -0,0 +1,13 @@
+#  Copyright (c) 2020 Rocky Bernstein
+
+def testtrue(self, lhs, n, rule, ast, tokens, first, last):
+    # FIXME: make this work for all versions
+    if self.version < 3.7:
+        return False
+    if rule == ("testtrue", ("expr", "jmp_true")):
+        pjit = tokens[min(last-1, n-2)]
+        # If we have a backwards (looping) jump then this is
+        # really a testfalse
+        return (pjit == "POP_JUMP_IF_TRUE" and
+                tokens[first].off2int() > pjit.attr)
+    return False