Clean up some of the code used in Chapter 5 (#21)

* cleanup some code

* rename dir

* clean up code

* minor corrections to text

Author: SathyaBhat

source-code/chapter-3/python-app/README.md

@@ -19,8 +19,3 @@ Refer to the [book repo](https://github.com/apress/practical-docker-with-python)
 
 where `<token>` is the [Telegram Bot API](https://core.telegram.org/bots/api) token
 
-
-### Credits
-
-- [Ken](https://github.com/KenStoneBlue) for letting me know that I didn't add requirements!
-- [Karan](https://github.com/mr-karan) for initial work

source-code/chapter-3/python-app/last_updated.txt

@@ -0,0 +1 @@
+232420721

source-code/chapter-3/python-app/telegram.py

@@ -10,7 +10,7 @@
 
 
 def get_updates(last_updated):
-    log.debug('Checking for requests, last updated passed is: {last_updated}')
+    log.info('Checking for requests, last updated passed is: {last_updated}')
     sleep(UPDATE_PERIOD)
     response = requests.get(f"{API_BASE}/getUpdates", params={'offset': last_updated+1})
     json_response = FALSE_RESPONSE

source-code/chapter-4/exercise-1/README.md

@@ -1,3 +1,3 @@
 ### README
 
-This exercise contains the source code for the first exercise of chapter 4. At the start of the chapter, we introduced a simple Dockerfile that did not build due to syntax errors. Here, you’ll fix the Dockerfile and add some of the instructions that you learned about in this chapter.
+This directory contains the source code for the first exercise of chapter 4. At the start of the chapter, we introduced a simple Dockerfile that did not build due to syntax errors. Here, you’ll fix the Dockerfile and add some of the instructions that you learned about in this chapter.

source-code/chapter-4/exercise-2/README.md

@@ -1,6 +1,6 @@
 ### README
 
-This exercise contains the source code for the second exercise of chapter 4. In this exercise, you will build two Docker images
+This directory contains the source code for the second exercise of chapter 4. In this exercise, you will build two Docker images
 
  - Using the standard build process using python:3 as the base image (present in [docker-multi-stage/standard-build](docker-multi-stage/standard-build) directory. 
  - Using Multi-Stage builds (present [docker-multi-stage/multistage-build](docker-multi-stage/multistage-build) directory. 

source-code/chapter-4/exercise-3/README.md

@@ -1,6 +1,6 @@
 ### README
 
-This exercise contains the source code for the third exercise of chapter 4. In this exercise, we compose a Dockerfile for Newsbot and then use the Dockerfile to build a Docker image and run the container.
+This directory contains the source code for the third exercise of chapter 4. In this exercise, we compose a Dockerfile for Newsbot and then use the Dockerfile to build a Docker image and run the container.
 
 
 ### Building the Docker image

source-code/chapter-5/exercise-1/README.md

@@ -1,3 +1,3 @@
 ### README
 
-This exercise contains the source code for the first exercise of chapter 5. In this exercise, we build an nginx Docker image with a Docker volume attached, which contains a custom nginx configuration. Toward the second part of the exercise, we will attach a bind mount and a volume containing a static web page and a custom nginx configuration. The intent of the exercise is help the readers understand how to leverage volumes and bind mounts to make local development easy.
+This directory contains the source code for the first exercise of chapter 5. In this exercise, we build an nginx Docker image with a Docker volume attached, which contains a custom nginx configuration. Toward the second part of the exercise, we will attach a bind mount and a volume containing a static web page and a custom nginx configuration. The intent of the exercise is help the readers understand how to leverage volumes and bind mounts to make local development easy.