Fix invalid error class (#6)

* Fixed invalid error class in generator.  Updated typos in README

* Updated the version

---------

Co-authored-by: Tracey A. Beauchat, Ph.D <107330374+TABeauchat@users.noreply.github.com>

README.md

@@ -100,11 +100,11 @@ end
 
 Altenative you can try the generator. (requires setting up the connection)
 
-    rails generate active_force_model Medication__c
+    rails generate active_force:model Medication__c
 
 The model generator also supports an optional namespace which will add a namespace to the generated model
 
-    rails generate active_force_model Medication__c SomeNamespace
+    rails generate active_force:model Medication__c SomeNamespace
 
 ### Associations
 

lib/active_force/version.rb

@@ -1,3 +1,3 @@
 module ActiveForce
-  VERSION = "0.9.0"
+  VERSION = "0.9.1"
 end

lib/generators/active_force/model/model_generator.rb

@@ -42,7 +42,7 @@ def sfdc_columns
 
     def table_exists?
       !! sfdc_columns
-      rescue Faraday::Error::ResourceNotFound
+      rescue Faraday::ResourceNotFound
         puts "The specified table name is not found. Be sure to append __c if it's custom"
     end