fixed the answer for exercise 6.18

ChaoMu · Nov 3, 2016 · 4216517 · 4216517
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commit 4216517
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diff --git a/ch06/README.md b/ch06/README.md
@@ -148,7 +148,7 @@ should be changed.
 ## Exercise 6.18
 (a)
 ```cpp
-bool compare(matrix &m1, matrix &m2){ /.../ }
+bool compare(const matrix &m1, const matrix &m2){ /.../ }
 ```
 (b)
 ```cpp