Update compiler feature list by Travis CI build 1509

Author: Travis CI

compiler_feature.txt

@@ -190,6 +190,7 @@ active          if_let_guard                        1.47.0   51114    None
 active          impl_trait_in_bindings              1.30.0   63065    None         2019-08-20 18:50:33 +0200
 active          in_band_lifetimes                   1.23.0   44524    None         2019-08-20 18:50:33 +0200
 active          infer_static_outlives_requirements  1.26.0   54185    None         2019-08-20 18:50:33 +0200
+active          inline_const                        1.49.0   76001    None         2020-09-21 16:10:31 -0300
 active          intrinsics                          1.0.0    None     None         2019-08-20 18:50:33 +0200
 active          isa_attribute                       1.48.0   74727    None         2020-10-08 23:23:27 +0100
 active          label_break_value                   1.28.0   48594    None         2019-08-20 18:50:33 +0200