✏️ Change docs for cyclonedx 1.5 version update (#341)

Changes
- Updates documentation reference to include cyclonedx v1.5, from
#337
- Changes reference to default version, from 1.4 to 1.5

Signed-off-by: leec94 <leec94@bu.edu>

README.md

@@ -110,7 +110,7 @@ Options:
   --output-file <output-file>                                  Output BOM filename, will write to stdout if no value provided.
   --input-format <autodetect|csv|json|protobuf|spdxjson|xml>   Specify input file format.
   --output-format <autodetect|csv|json|protobuf|spdxjson|xml>  Specify output file format.
-  --output-version <v1_0|v1_1|v1_2|v1_3|v1_4>                  Specify output BOM specification version. (ignored for CSV and SPDX formats)  
+  --output-version <v1_0|v1_1|v1_2|v1_3|v1_4|v1_5>                  Specify output BOM specification version. (ignored for CSV and SPDX formats)  
 ```
 
 ### Examples
@@ -263,7 +263,7 @@ Usage:
 Options:
   --input-file <input-file>                   Input BOM filename, will read from stdin if no value provided.
   --input-format <autodetect|json|xml>        Specify input file format.
-  --input-version <v1_0|v1_1|v1_2|v1_3|v1_4>  Specify input file specification version (defaults to v1.4)
+  --input-version <v1_0|v1_1|v1_2|v1_3|v1_4|v1_5>  Specify input file specification version (defaults to v1.5)
   --fail-on-errors                            Fail on validation errors (return a non-zero exit code)
 ```
 

src/cyclonedx/Commands/ValidateCommand.cs

@@ -35,7 +35,7 @@ public static void Configure(RootCommand rootCommand)
             var subCommand = new System.CommandLine.Command("validate", "Validate a BOM");
             subCommand.Add(new Option<string>("--input-file", "Input BOM filename, will read from stdin if no value provided."));
             subCommand.Add(new Option<ValidationBomFormat>("--input-format", "Specify input file format."));
-            subCommand.Add(new Option<SpecificationVersion?>("--input-version", "Specify input file specification version (defaults to v1.4)"));
+            subCommand.Add(new Option<SpecificationVersion?>("--input-version", "Specify input file specification version (defaults to v1.5)"));
             subCommand.Add(new Option<bool>("--fail-on-errors", "Fail on validation errors (return a non-zero exit code)"));
             subCommand.Handler = CommandHandler.Create<ValidateCommandOptions>(Validate);
             rootCommand.Add(subCommand);