Merge pull request #30 from jbj/incomplete-parity-check-medium

C++: Downgrade cpp/incomplete-parity-check from high to medium precision [CPP-236]

Author: geoffw0

cpp/ql/src/Likely Bugs/Arithmetic/BadCheckOdd.ql

@@ -4,7 +4,7 @@
  *              negative numbers.
  * @kind problem
  * @problem.severity warning
- * @precision high
+ * @precision medium
  * @id cpp/incomplete-parity-check
  * @tags reliability
  *       correctness