Update README.md

Author: Cheng-Lin-Li

Propositional_Logic/README.md

@@ -186,7 +186,3 @@ RESOURCE_WALKSAT = 49
 * Stuart Russell and Peter Norvig, Artificial Intelligence: A Modern Approach (AIMA). Prentice Hall, 3rd Edition. [http://aima.cs.berkeley.edu/](http://aima.cs.berkeley.edu/)
 * AIMA reference code, aimacode/aima-python : https://github.com/aimacode/aima-python
 * MIT Open Course Ware. [Resolution Theorem Proving: Propositional Logic](https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-825-techniques-in-artificial-intelligence-sma-5504-fall-2002/lecture-notes/Lecture7FinalPart1.pdf)
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-## Notice:
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-This code is just for your reference of the implementation. The code does not give a guarantee of 100% correctness.