Allow repositories used by setup to be overridden

README.md

@@ -106,6 +106,14 @@ or environment variables. See the [Coursier
 documentation](https://get-coursier.io/docs/other-credentials.html#property-file)
 for more information.
 
+`rules_jvm_external_setup` uses a default list of maven repositories to download
+ `rules_jvm_external`'s own dependencies from. Should you wish to  change this, 
+ use the `repositories` parameter:
+
+ ```python 
+rules_jvm_external_setup(repositories = ["https://mycorp.com/artifacts"])
+```
+
 Next, reference the artifacts in the BUILD file with their versionless label:
 
 ```python

repositories.bzl

@@ -1,14 +1,16 @@
 load("//:defs.bzl", "maven_install")
 
-def rules_jvm_external_deps():
+_DEFAULT_REPOSITORIES = [
+    "https://repo1.maven.org/maven2",
+    "https://jcenter.bintray.com/",
+    "https://maven.google.com",
+]
+
+def rules_jvm_external_deps(repositories = _DEFAULT_REPOSITORIES):
     maven_install(
         name = "rules_jvm_external_deps",
         artifacts = [
         ],
         maven_install_json = "@rules_jvm_external//:rules_jvm_external_deps_install.json",
-        repositories = [
-            "https://repo1.maven.org/maven2",
-            "https://jcenter.bintray.com/",
-            "https://maven.google.com",
-        ],
+        repositories = repositories,
     )