Throw logic error if switch doesn't handle case.

lib/include/account_mastodon.hpp

@@ -40,6 +40,7 @@ using std::thread;
  *  @brief  Interact with an account using the Mastodon API.
  *
  *  @throw  std::runtime_error No hashtag or list ID given.
+ *  @throw  std::logic_error   Unhandled stream type. (Should never happen)
  *
  *  @since  0.1.0
  *
@@ -97,6 +98,7 @@ public:
      *  @param  id   The hashtag or list id.
      *
      *  @throw  std::runtime_error  hashtag or list ID given.
+     *  @throw  std::logic_error   Unhandled stream type. (Should never happen)
      *
      *  @since  0.1.0
      */
@@ -109,6 +111,7 @@ public:
      *  @param  id   The hashtag or list id.
      *
      *  @throw  std::runtime_error No hashtag or list ID given.
+     *  @throw  std::logic_error   Unhandled stream type. (Should never happen)
      *
      *  @since  0.1.0
      */

lib/src/account_mastodon.cpp

@@ -17,11 +17,13 @@
 #include "account_mastodon.hpp"
 #include "version.hpp"
 
+#include <exception>
 #include <stdexcept>
 
 namespace FediPotato
 {
 
+using std::logic_error;
 using std::runtime_error;
 
 MastodonAPI::MastodonAPI(const string_view application_name,
@@ -91,6 +93,8 @@ string MastodonAPI::get_stream_id(const stream_type type,
         break;
     }
     }
+
+    throw logic_error{"Unhandled stream type."};
 }
 
 } // namespace FediPotato