update CODEOWNERS (#4127)

* update CODEOWNERS

* include R build scripts

.github/CODEOWNERS

@@ -7,7 +7,7 @@
 # offer a reasonable automatic best-guess
 
 # catch-all rule (this only gets matched if no rules below match)
-*    @guolinke @StrikerRUS @jameslamb @Laurae2
+*    @guolinke @StrikerRUS @jameslamb @shiyu1994
 
 # other catch-alls that will get matched if specific rules below are not matched
 *.R    @Laurae2 @jameslamb
@@ -25,10 +25,12 @@ tests/data/    @guolinke @chivee @btrotta @shiyu1994
 windows/    @guolinke @chivee @btrotta @StrikerRUS @shiyu1994
 
 # R code
+build_r.R    @jameslamb @StrikerRUS
+build-cran-package.sh    @jameslamb @StrikerRUS
 R-package/    @Laurae2 @jameslamb
 
 # Python code
-python-package/    @StrikerRUS @chivee @wxchan @henry0312 @shiyu1994
+python-package/    @StrikerRUS @chivee @wxchan @henry0312 @shiyu1994 @jameslamb
 
 # Dask integration
 python-package/lightgbm/dask.py    @jameslamb
@@ -38,11 +40,11 @@ tests/python_package_test/test_dask.py    @jameslamb
 helpers/    @StrikerRUS @guolinke
 
 # CI administrative stuff
-.ci/    @StrikerRUS @Laurae2 @jameslamb
-docs/    @StrikerRUS @Laurae2 @jameslamb
+.ci/    @StrikerRUS @jameslamb
+docs/    @StrikerRUS @jameslamb
 examples/     @StrikerRUS @jameslamb @guolinke
-*.yml    @StrikerRUS @Laurae2 @jameslamb
-.vsts-ci.yml    @Laurae2
+*.yml    @StrikerRUS @jameslamb
+.vsts-ci.yml    @StrikerRUS @jameslamb
 
 # docker setup
 docker/    @StrikerRUS @jameslamb