Remove line associated with old poetry version

Author: drice

lib/poetry.js

@@ -42,11 +42,7 @@ function pyprojectTomlToRequirements() {
 
   const editableFlag = new RegExp(/^-e /gm);
   const sourceRequirements = path.join(this.servicePath, 'requirements.txt');
-  const requirementsContents =
-    res.stdout.toString().trim() || // As of poetry 1.0.0b1, requirements.txt is printed to standard output when the -o option is not specified.
-    fse.readFileSync(sourceRequirements, {
-      encoding: 'utf-8'
-    });
+  const requirementsContents = fse.readFileSync(sourceRequirements, { encoding: 'utf-8' });
 
   if (requirementsContents.match(editableFlag)) {
     this.serverless.cli.log(