try to fix the build failure

realwunan · realwunan · commit 346e35809483 · 2018-11-15T11:31:38.000+08:00
diff --git a/_zh-cn/tour/operators.md b/_zh-cn/tour/operators.md
@@ -18,7 +18,7 @@ previous-page: type-inference
 10.+(1)
 ```
 
-而中缀运算符则更易读：
+而中缀运算符则更易读:
 ```
 10 + 1
 ```
