Grammar fixes (#82)

* Grammar and Markdown fixes

* Update copyright date

* Add date range

Co-authored-by: dahn <daan.hoogland@gmail.com>

Co-authored-by: dahn <daan.hoogland@gmail.com>
diff --git a/LICENSE b/LICENSE
index 20092be..5144fee 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2013 The Apache Software Foundation
+Copyright (c) 2013 - 2021 The Apache Software Foundation
 
 
                                  Apache License
diff --git a/README.md b/README.md
index b0c5060..b185e9c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Source of Apache CloudStack Web site
 ====================================
 
-This is built using [middleman](https://middlemanapp.com)
+This is built using [middleman](https://middlemanapp.com).
 
     $ gem install middleman
     $ bundle install
@@ -14,7 +14,7 @@
 ```
 
 For more details look at: 
-https://github.com/sstephenson/execjs/issues/71
+[https://github.com/sstephenson/execjs/issues/71](https://github.com/sstephenson/execjs/issues/71)
 
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