ccon: Bump to v0.3.0

Potentially backwards incompatible changes since v0.2.0:

ccon:

* Replace block_forever with exit(0).
* Shift namespace-path and host-executable file-opens to before the
  clone.

Backwards compatible changes since v0.2.0:

ccon:

* Set parent death signal to SIGKILL.
* Add a --config-string option so you don't need pipes or process
  substitution to pass a config string into ccon.
* Added more config validation, although coverage is still not
  complete.
* Assorted bug fixes.

README:

* Lots of typo fixes.

wrappers (with examples):

* ccon-oci: Add a wrapper for formal OCI compliance (currently just
  the namespace features, not the resource limits).
* ccon-ced: A create/exec/delete wrapper around ccon.

README.md

@@ -114,15 +114,15 @@ or (using [Bash][bash]'s [process
 substitution][bash-process-substitution]):
 
 ```
-$ ccon --config <(echo '{"version": "0.2.0", "process": …}')
+$ ccon --config <(echo '{"version": "0.3.0", "process": …}')
 ```
 
 You can also specify the config JSON directly on the command line with
 `--config-string`, which may be convenient in situations where using
 pipes or process substitution are too awkward:
 
 ```
-$ ccon --config-string '{"version": "0.2.0", "process": …}'
+$ ccon --config-string '{"version": "0.3.0", "process": …}'
 ```
 
 There are additional examples focusing on specific tasks in the
@@ -137,7 +137,7 @@ The ccon version represented in the config file.
 #### Example
 
 ```json
-"version": "0.2.0"
+"version": "0.3.0"
 ```
 
 ### Namespaces

ccon.c

@@ -220,7 +220,7 @@ static void usage(FILE * stream, char *path)
 
 static void version()
 {
-	printf("ccon 0.2.0\n");
+	printf("ccon 0.3.0\n");
 }
 
 static void kill_child(int signum, siginfo_t * siginfo, void *unused)
@@ -375,6 +375,7 @@ static int validate_version(json_t * config)
 	const char *supported_versions[] = {
 		"0.1.0",
 		"0.2.0",
+		"0.3.0",
 		NULL,
 	};
 	int i, err;

examples/good/create-exec-delete-root/create.json

@@ -1,5 +1,5 @@
 {
-  "version": "0.1.0",
+  "version": "0.3.0",
   "namespaces": {
     "mount": {},
     "ipc": {},