docs(Plugin Developer Guide): Update lifecycle list (#1874)

The old list was missing analyzeCommits lifecycle and the verification lifecycle was incorrectly listed as "verify", when it should currently be "verifyConditions" in order to properly load.

docs/developer-guide/plugin.md

@@ -2,7 +2,8 @@
 
 To create a plugin for `semantic-release`, you need to decide which parts of the release lifecycle are important to that plugin. For example, it is best to always have a `verify` step because you may be receiving inputs from a user and want to make sure they exist. A plugin can abide by any of the following lifecycles:
 
-- `verify`
+- `analyzeCommits`
+- `verifyConditions`
 - `prepare`
 - `publish`
 - `success`
@@ -103,4 +104,4 @@ const { env } = context;
 if (env.GITHUB_TOKEN) {
     //...
 }
-```
+```