fix codeowners (#2429)

.github/CODEOWNERS

@@ -7,31 +7,31 @@
 # offer a reasonable automatic best-guess
 
 # main C++ code
-include/*    @guolinke @chivee
-src/*    @guolinke @chivee
+include/    @guolinke @chivee
+src/    @guolinke @chivee
 CmakeLists.txt    @guolinke @chivee @Laurae2 @jameslamb @wxchan @henry0312 @StrikerRUS @huanzhang12
 
 # R code
 include/LightGBM/lightgbm_R.h    @Laurae2 @jameslamb
 include/LightGBM/R_object_helper.h    @Laurae2 @jameslamb
 src/lightgbm_R.cpp    @Laurae2 @jameslamb
-R-package/*    @Laurae2 @jameslamb
+R-package/    @Laurae2 @jameslamb
 *.R    @Laurae2 @jameslamb
 
 # Python code
-python-package/*    @StrikerRUS @chivee @wxchan @henry0312
+python-package/    @StrikerRUS @chivee @wxchan @henry0312
 
 # helpers
-helpers/*    @StrikerRUS @guolinke
+helpers/    @StrikerRUS @guolinke
 
 # CI administrative stuff
-.ci/*    @StrikerRUS @Laurae2 @jameslamb
-docs/*    @StrikerRUS @Laurae2 @jameslamb
+.ci/    @StrikerRUS @Laurae2 @jameslamb
+docs/    @StrikerRUS @Laurae2 @jameslamb
 *.yml    @StrikerRUS @Laurae2 @jameslamb
 .vsts-ci.yml    @Laurae2
 
 # GPU code
-docker/gpu/*    @huanzhang12
+docker/gpu/    @huanzhang12
 docs/GPU-*.rst    @huanzhang12
 src/treelearner/gpu_tree_learner.cpp    @huanzhang12 @guolinke @chivee
 src/treelearner/tree_learner.cpp    @huanzhang12 @guolinke @chivee