tag incompatible type rules (#1968)

Author: pq

lib/src/rules/always_specify_types.dart

@@ -88,6 +88,9 @@ class AlwaysSpecifyTypes extends LintRule implements NodeLintRule {
             details: _details,
             group: Group.style);
 
+  @override
+  List<String> get incompatibleRules => const ['omit_local_variable_types'];
+
   @override
   void registerNodeProcessors(
       NodeLintRegistry registry, LinterContext context) {

lib/src/rules/omit_local_variable_types.dart

@@ -52,6 +52,9 @@ class OmitLocalVariableTypes extends LintRule implements NodeLintRule {
             details: _details,
             group: Group.style);
 
+  @override
+  List<String> get incompatibleRules => const ['always_specify_types'];
+
   @override
   void registerNodeProcessors(
       NodeLintRegistry registry, LinterContext context) {