fix: missing `constants` in the rockspsec (#68)

diff --git a/rockspec/skywalking-nginx-lua-0.4-0.rockspec b/rockspec/skywalking-nginx-lua-0.4-1.rockspec
similarity index 90%
rename from rockspec/skywalking-nginx-lua-0.4-0.rockspec
rename to rockspec/skywalking-nginx-lua-0.4-1.rockspec
index 10ba4d6..8425973 100644
--- a/rockspec/skywalking-nginx-lua-0.4-0.rockspec
+++ b/rockspec/skywalking-nginx-lua-0.4-1.rockspec
@@ -1,8 +1,8 @@
 package = "skywalking-nginx-lua"
-version = "0.4-0"
+version = "0.4-1"
 source = {
    url = "git://github.com/apache/skywalking-nginx-lua",
-   branch = "v0.4.0",
+   branch = "v0.4.1",
 }
 
 description = {
@@ -20,6 +20,7 @@
    type = "builtin",
    modules = {
       ["skywalking.client"] = "lib/skywalking/client.lua",
+      ["skywalking.constants"] = "lib/skywalking/constants.lua",
       ["skywalking.correlation_context"] = "lib/skywalking/correlation_context.lua",
       ["skywalking.management"] = "lib/skywalking/management.lua",
       ["skywalking.segment_ref"] = "lib/skywalking/segment_ref.lua",
diff --git a/rockspec/skywalking-nginx-lua-master-0.rockspec b/rockspec/skywalking-nginx-lua-master-0.rockspec
index 85b444d..330a05d 100644
--- a/rockspec/skywalking-nginx-lua-master-0.rockspec
+++ b/rockspec/skywalking-nginx-lua-master-0.rockspec
@@ -20,6 +20,7 @@
    type = "builtin",
    modules = {
       ["skywalking.client"] = "lib/skywalking/client.lua",
+      ["skywalking.constants"] = "lib/skywalking/constants.lua",
       ["skywalking.correlation_context"] = "lib/skywalking/correlation_context.lua",
       ["skywalking.management"] = "lib/skywalking/management.lua",
       ["skywalking.segment_ref"] = "lib/skywalking/segment_ref.lua",