Update changelog for 6.4.2 and add CI badge - nerdtree

commit 3fb31b2e811252a9c545d41516c5c355acd5b5d1
parent 907587f7a3ffe35ebbf358828cfd42e07ddf3fed
Author: Caleb Maclennan <caleb@alerque.com>
Date:   Tue, 31 Dec 2019 09:55:37 +0300

Update changelog for 6.4.2 and add CI badge

Diffstat:
M CHANGELOG.md  | 1 +
M README.markdown  | 2 +-

2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -8,6 +8,7 @@
         - **.PATCH**: Pull Request Title (PR Author) [PR Number](Link to PR)
 -->
 #### 6.4
+- **.2**: Lint vimscript, fix errors and warnings, add CI job to review PRs (Caleb Maclennan) [#1071](https://github.com/preservim/nerdtree/pull/1071)
 - **.1**: Ensure backward compatibility. v:t_func is not available before Vim 8.0 (Phil Runninger)
 - **.0**: Allow use of function references as callbacks (HiPhish) [#1067](https://github.com/scrooloose/nerdtree/pull/1067)
 #### 6.3
diff --git a/README.markdown b/README.markdown
@@ -1,4 +1,4 @@
-The NERDTree
+The NERDTree [![Vint](https://github.com/preservim/nerdtree/workflows/Vint/badge.svg)](https://github.com/preservim/nerdtree/actions?workflow=Vint)
 =============
 
 Introduction