Issue extension doesn't support windows new lines

[rnveach]

flexmark-java/flexmark-ext-gfm-issues/src/main/java/com/vladsch/flexmark/ext/gfm/issues/internal/GfmIssuesInlineParserExtension.java

Line 13 in 07b83fb

public static final Pattern GITHUB_ISSUE = Pattern.compile("^(#)(\\d+)(?=[ \\t]+|\\n|$)");

Expression has \n but it doesn't have \r. Windows new lines are in the form \r\n.
This causes text written as #1\r\n to not get recognized and converted to links by the Issue extension, but it will recognize #1\n and convert it correctly.

[rnveach]

GfmUsersInlineParserExtension will have the same issue as it has \n in it.

flexmark-java/flexmark-ext-gfm-users/src/main/java/com/vladsch/flexmark/ext/gfm/users/internal/GfmUsersInlineParserExtension.java

Line 13 in 07b83fb

public static final Pattern GITHUB_USER = Pattern.compile("^(@)([a-z\\d](?:[a-z\\d]|-(?=[a-z\\d])){0,38})(?=[ \\t]+|\\n|$)", Pattern.CASE_INSENSITIVE);

[vsch]

@rnveach, thank you for catching it. I used to develop on Windows and was always annoyed when unix utilities failed to work with "\r\n". Now that I am on OS X, I can see how easy it is to miss this.

[vsch]

@rnveach, fixed. Repo updated. Maven update in progress.