Make the certificate data read-only. (#7)
diff --git a/root_certificates.cc b/root_certificates.cc
index 5a6485d..afebe71 100644
--- a/root_certificates.cc
+++ b/root_certificates.cc
@@ -14,7 +14,7 @@
namespace dart {
namespace bin {
-unsigned char root_certificates_pem_[] = {
+const unsigned char root_certificates_pem_[] = {
0x0a, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20,
0x43, 0x45, 0x52, 0x54, 0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45, 0x2d,
0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x44, 0x64, 0x54, 0x43,
