Merge pull request #7618 from ethereum/addMoreAbstractKeywordsInTests

Add some more abstract keywords in test to make sure the correct property is tested.

docs/050-breaking-changes.rst

@@ -345,7 +345,8 @@ commandline compiler for linking):
 
 ::
 
-    pragma solidity >=0.5.0 <0.7.0;
+    // This will not compile with 0.6.0 anymore.
+    pragma solidity >=0.5.0 <0.5.99;
 
     library OldLibrary {
         function someFunction(uint8 a) public returns(bool);

docs/060-breaking-changes.rst

@@ -21,6 +21,11 @@ This section lists purely syntactic changes that do not affect the behavior of e
 
 * Function ``push(value)`` for dynamic storage arrays do not return the new length anymore.
 
+* The new keyword ``abstract`` can be used to mark contracts as abstract. It has to be used
+  if a contract does not implement all its functions.
+
+* Libraries have to implement all their functions, not only the internal ones.
+
 * New reserved keywords: ``virtual``.
 
 Semantic Only Changes