Updated pip to pip3 (#205)

* Updates pip to pip3

Author: RJ Lohan

README.md

@@ -10,8 +10,8 @@ Usage
 If you are using this package to build resource providers for CloudFormation, install the (CloudFormation CLI)[https://github.com/aws-cloudformation/aws-cloudformation-rpdk] and the (CloudFormation CLI Java Plugin)[https://github.com/aws-cloudformation/aws-cloudformation-rpdk-java-plugin]
 
 ```
-pip install cloudformation-cli
-pip install cloudformation-cli-java-plugin
+pip3 install cloudformation-cli
+pip3 install cloudformation-cli-java-plugin
 ```
 
 Refer to the documentation for the [CloudFormation CLI](https://github.com/aws-cloudformation/aws-cloudformation-rpdk) for usage instructions.
@@ -22,7 +22,7 @@ Development
 First, you will need to install the (CloudFormation CLI)[https://github.com/aws-cloudformation/aws-cloudformation-rpdk], as it is a required dependency:
 
 ```
-pip install cloudformation-cli
+pip3 install cloudformation-cli
 ```
 
 For changes to the plugin, a Python virtual environment is recommended.
@@ -31,7 +31,7 @@ For changes to the plugin, a Python virtual environment is recommended.
 python3 -m venv env
 source env/bin/activate
 # assuming cloudformation-cli has already been cloned/downloaded
-pip install -e .
+pip3 install -e .
 pre-commit install
 ```
 

README.rst

@@ -18,8 +18,8 @@ Plugin)[https://github.com/aws-cloudformation/aws-cloudformation-rpdk-java-plugi
 
 .. code-block:: bash
 
-   pip install cloudformation-cli
-   pip install cloudformation-cli-java-plugin
+   pip3 install cloudformation-cli
+   pip3 install cloudformation-cli-java-plugin
 
 Refer to the documentation for the `CloudFormation CLI`_ for usage
 instructions.
@@ -33,7 +33,7 @@ it is a required dependency:
 
 .. code-block:: bash
 
-   pip install cloudformation-cli
+   pip3 install cloudformation-cli
 
 For changes to the plugin, a Python virtual environment is recommended.
 
@@ -42,7 +42,7 @@ For changes to the plugin, a Python virtual environment is recommended.
    python3 -m venv env
    source env/bin/activate
    # assuming cloudformation-cli has already been cloned/downloaded
-   pip install -e .
+   pip3 install -e .
    pre-commit install
 
 Linting and running unit tests is done via `pre-commit`_, and so is