Display completions for upper cased aliases

This commit fixes a bug when SQLTools did not show any completions
when upper cased alias was used.
Fixes #142

Author: tkopets

SQLToolsAPI/Completion.py

@@ -381,7 +381,7 @@ def _singleDotCompletions(self, prefix, identifiers, joinAlias=None):
 
         # we use set, as we are interested only in unique identifiers
         for ident in identifiers:
-            if ident.has_alias() and ident.alias == prefixParent:
+            if ident.has_alias() and ident.alias.lower() == prefixParent:
                 if ident.is_query_alias:
                     sqlQueryAliases.add(ident.alias)