Update prefix from master to main

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 076d739..53ec787 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -5,14 +5,14 @@
 # Bazel rule definitions
 http_archive(
     name = "rules_cc",
-    strip_prefix = "rules_cc-master",
+    strip_prefix = "rules_cc-main",
     urls = ["https://github.com/bazelbuild/rules_cc/archive/master.zip"],
 )
 
 # Google Test framework, used by most unit-tests.
 http_archive(
     name = "com_google_googletest",
-    strip_prefix = "googletest-master",
+    strip_prefix = "googletest-main",
     urls = ["https://github.com/google/googletest/archive/master.zip"],
 )