feat(inputs): add semantic_version to specify version range(#3)

semantic_version: Specify specifying version range for semantic-release. If no version range is
specified, semantic-release@^15 will be used by default.

src/installSpecifyingVersionSemantic.task.js

@@ -0,0 +1,25 @@
+const path = require('path');
+const core = require('@actions/core');
+const exec = require('./_exec');
+const inputs = require('./inputs.json');
+
+/**
+ * Install Specifying Version semantic-release
+ * @returns {Promise<void>}
+ */
+module.exports = async () => {
+  const semantic_version = core.getInput(inputs.semantic_version);
+
+  if (!semantic_version) {
+    return Promise.resolve();
+  }
+
+  const {stdout, stderr} = await exec(`npm install semantic-release@${semantic_version}`, {
+    cwd: path.resolve(__dirname)
+  });
+  core.debug(stdout);
+
+  if (stderr) {
+    return Promise.reject(stderr);
+  }
+};