Minor README updates. Rename 3RD-PARTY file to not interfere with license detection (#22)

* Fix LICENSE to it is recognized by GitHub. Minor README changes.

* Rename 3RD-PARTY and touch LICENSE

* Add 3RD-PARTY.txt to copyright exclude

LICENSE.txt

@@ -1,5 +1,4 @@
 
-
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/

README.md

@@ -28,7 +28,7 @@ In either case your application is just a Java SE program.
 
 ## Documentation
 
-Latest documentation and javadocs are available at <https://helidon.io/docs/latest>.
+Latest documentation and javadocs are available at <http://helidon.io/docs/latest>.
 
 ## Get Started
 
@@ -55,6 +55,10 @@ files that are valid Java 9 modules containing Java 8 bytecodes.
 
 You also need Maven. We recommend 3.5 or newer.
 
+Building the documentation requires the `dot` utility from Graphviz.
+This is included in many Linux distributions. For other platforms
+see <http://www.graphviz.org/>.
+
 **Full build**
 ```bash
 $ mvn install

etc/copyright-exclude.txt

@@ -26,6 +26,7 @@ jaxb.index
 /LICENSE.txt
 /copyright.txt
 /3RD-PARTY-LICENSE.txt
+/3RD-PARTY.txt
 .pem
 .p8
 .pkcs8.pem