fix: Get the same behavior described in Docs(#71) (#85)

Now trying read body path first then falling back on body

Author: yin1999

__tests__/util.test.ts

@@ -58,9 +58,9 @@ describe("util", () => {
         })
       );
     });
-    it("defaults to body when both body and body path are provided", () => {
+    it("defaults to body path when both body and body path are provided", () => {
       assert.equal(
-        "foo",
+        "bar",
         releaseBody({
           github_ref: "",
           github_repository: "",

src/util.ts

@@ -19,9 +19,9 @@ export interface Config {
 
 export const releaseBody = (config: Config): string | undefined => {
   return (
-    config.input_body ||
     (config.input_body_path &&
-      readFileSync(config.input_body_path).toString("utf8"))
+      readFileSync(config.input_body_path).toString("utf8")) ||
+    config.input_body
   );
 };