Fix problem zip individually

Author: Felipe Santos

lib/inject.js

@@ -75,7 +75,7 @@ function moveModuleUp(source, target, module) {
 function injectAllRequirements(funcArtifact) {
   this.serverless.cli.log('Injecting required Python packages to package...');
 
-  if (this.options.zip) {
+  if (this.options.zip && !this.serverless.service.package.individually) {
     return;
   }
 
@@ -107,13 +107,15 @@ function injectAllRequirements(funcArtifact) {
           return func;
         }
       })
-      .map(func =>
-        injectRequirements(
-          path.join('.serverless', func.module, 'requirements'),
-          func.package.artifact,
-          this.options
-        )
-      );
+      .map(func => {
+        return this.options.zip
+          ? injectRequirements(
+            path.join('.serverless', func.module, 'requirements'),
+            func.package.artifact,
+            this.options
+          )
+          : func
+      });
   } else {
     return injectRequirements(
       path.join('.serverless', 'requirements'),