Rstyle (#91)

* refactor

* change table style

Author: zwfang

solutions/README.md

@@ -1,7 +1,7 @@
 ### Solutions for LeetCode algorithm problems, continually updating.
 
 |ID|Title && solution|Coefficient of difficulty|remarks|
-|:---:|:---:|:---:|:---:|
+|:---:|:---|:---:|:---:|
 |0001|[Two Sum](0001_two_sum/twosum.go)|Easy|*`array;`*  *`lookup table`*|
 |0002|[Add Two Numbers](0002_add_two_numbers/add_two_numbers.go)|Medium|*`linked list`*|
 |0003|[Longest Substring Without Repeating Characters](0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go)|Medium|*`sliding window`*|