Update GPG key in docs. Closes #182.

README.md

@@ -53,17 +53,18 @@ mkdir -p /opt/oscal-cli && cd /opt/oscal-cli
 ```
 NOTE: 
 
-2. Download the zipped oscal-cli Java package. Download your preferred version, but we recommend [the latest stable release on the Maven Central repository](https://repo1.maven.org/maven2/gov/nist/secauto/oscal/tools/oscal-cli/cli-core/).
+2. Download the zipped oscal-cli Java package. Download your preferred version, but we recommend [the latest stable release on the Maven Central repository](https://repo1.maven.org/maven2/gov/nist/secauto/oscal/tools/oscal-cli/cli-core/). You may also download [development snapshots](https://oss.sonatype.org/content/repositories/snapshots/gov/nist/secauto/oscal/tools/oscal-cli/) to evaluate new features or bug fixes merged into develop before they are finalized in a published release.
+
 ```
-wget -q https://repo1.maven.org/maven2/gov/nist/secauto/oscal/tools/oscal-cli/cli-core/0.3.3/cli-core-0.3.3-oscal-cli.zip.asc # download the release signature
-wget -q https://repo1.maven.org/maven2/gov/nist/secauto/oscal/tools/oscal-cli/cli-core/0.3.3/cli-core-0.3.3-oscal-cli.zip # download the release archive
-gpg --keyserver hkps://pgp.mit.edu:443 --recv-keys 0xE5C8BE7A12463927FDB562F9CAC75F72946C412C # import or re-import the release signing key for oscal-cli
-gpg --verify cli-core-0.3.3-oscal-cli.zip.asc # verify the signature for the release with signing key
+wget -q https://repo1.maven.org/maven2/gov/nist/secauto/oscal/tools/oscal-cli/cli-core/1.0.1/cli-core-1.0.1-oscal-cli.zip.asc # download the release signature
+wget -q https://repo1.maven.org/maven2/gov/nist/secauto/oscal/tools/oscal-cli/cli-core/1.0.1/cli-core-1.0.1-oscal-cli.zip # download the release archive
+gpg --keyserver hkps://pgp.mit.edu:443 --recv-keys 6387E83B4828A504 # import or re-import the NIST OSCAL Release Engineering Key
+gpg --verify cli-core-1.0.1-oscal-cli.zip.asc # verify the signature for the release with signing key
 ```
 
 3. Extract oscal-cli into the directory.
 ```
-unzip cli-core-0.3.3-oscal-cli.zip
+unzip cli-core-1.0.1-oscal-cli.zip
 ```
 
 4. (Recommended) Add oscal-cli's directory to your path.