honor escaped newlines in requirements.txt

fixes #261

Author: dschep

lib/pip.js

@@ -295,6 +295,7 @@ function generateRequirementsFile(source, target, options) {
   const noDeploy = new Set(options.noDeploy || []);
   const requirements = fse
     .readFileSync(source, { encoding: 'utf-8' })
+    .replace(/\\\n/g, ' ')
     .split(/\r?\n/);
   var prepend = [];
   const filteredRequirements = requirements.filter(req => {

tests/base/package.json

@@ -9,6 +9,6 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "serverless-python-requirements": "file:serverless-python-requirements-4.2.1.tgz"
+    "serverless-python-requirements": "file:serverless-python-requirements-4.2.4.tgz"
   }
 }