Update README.md

Author: eengl

README.md

@@ -10,15 +10,15 @@ fortran-strings is a Fortran library and module which contains functions for com
 
 The function names are prefixed with ``str_``.  The following is a list of available functions:
 
-* str_count - Count the occurrences of a substring in a string.
-* str_replace - Replace a substring with another substring within a parent string.
-* str_upper - Convert all letters to uppercase.
-* str_lower - Convert all letters to lowercase.
-* str_split - Split string based on a character delimiter and return string given by the column number.
-* str_uniq - Removed duplicative entries from a \b delimited string.
-* str_zfill - Pad a string with zeroes ("0") to specified width. If width is <= input string width, then the original string is returned.
-* str_center - Center a string to a specified width.  The default character to fill in the centered string is a blank character.
-* str_reverse - Reverse a string.
+* **str_count** - Count the occurrences of a substring in a string.
+* **str_replace** - Replace a substring with another substring within a parent string.
+* **str_upper** - Convert all letters to uppercase.
+* **str_lower** - Convert all letters to lowercase.
+* **str_split** - Split string based on a character delimiter and return string given by the column number.
+* **str_uniq** - Removed duplicative entries from a \b delimited string.
+* **str_zfill** - Pad a string with zeroes ("0") to specified width. If width is <= input string width, then the original string is returned.
+* **str_center** - Center a string to a specified width.  The default character to fill in the centered string is a blank character.
+* **str_reverse** - Reverse a string.
 
 ## Requirements