Find a bug in searchInsertPosition.cpp

[pezy]

Have a look at: https://github.com/haoel/leetcode/blob/master/src/searchInsertPosition/searchInsertPosition.cpp#L28

int mid = low +(high-low)/2;

would occur overflow. try to change to this:

int mid = (high-low)/2;

[pezy]

Sorry, My mistake.