Change nonstatic to library usage

Per review, we should call it library usage. Also pointed out that LGPL
does require disclosing source.

_config.yml

@@ -12,9 +12,9 @@ rules:
     disclose-source:
       description: Source code must be made available when distributing the software. In the case of LGPL only the source for the library (and not the entire program) must be made available.
       label: Disclose Source
-    nonstatic-linkage:
-      description: The library must be linked in a way that allows it to be replaced with a similar library
-      label: Nonstatic Linkage
+    library-usage:
+      description: The library may be used within a proprietary application. 
+      label: Library usage
     rename: 
       description: You must change the name of the software if you modify it.
       label: Rename

licenses/lgpl-v2.1.txt

@@ -11,7 +11,8 @@ note: The Free Software Foundation recommends taking the additional step of addi
 
 required:
   - include-copyright
-  - nonstatic-linkage
+  - library-usage
+  - disclose-source
 
 permitted:
   - commercial-use

licenses/lgpl-v3.txt

@@ -11,7 +11,8 @@ note: The Free Software Foundation recommends taking the additional step of addi
 
 required:
   - include-copyright
-  - nonstatic-linkage
+  - library-usage
+  - disclose-source
 
 permitted:
   - commercial-use