Merge pull request #1207 from r-lib/turn-on-all-linters

Use `all_linters()` instead of using tags

Author: IndrajeetPatil

.lintr

@@ -1,13 +1,11 @@
-linters: linters_with_tags(
-    tags = NULL,
+linters: all_linters(
     commented_code_linter = NULL,
     cyclocomp_linter = cyclocomp_linter(40),
     fixed_regex_linter = NULL,
     function_argument_linter = NULL,
     indentation_linter = NULL,
     line_length_linter(120L),
     namespace_linter = NULL,
-    nested_ifelse_linter = NULL,
     nzchar_linter = NULL,
     object_name_linter = NULL,
     object_length_linter(70L),