Bugfix/increase tokens (#132)

* feat(api.ts): add support for OPENAI_MAX_TOKENS environment variable
feat(config.ts): add OPENAI_MAX_TOKENS to CONFIG_KEYS and configValidators

* 2.0.2

* 2.0.3

* docs(README.md): add GPT-4 usage instructions and mention the cost difference compared to GPT-3.5-turbo

---------

Co-authored-by: di-sukharev <dim.sukharev@gmail.com>

src/commands/config.ts

@@ -10,6 +10,7 @@ import { getI18nLocal } from '../i18n';
 
 export enum CONFIG_KEYS {
   OPENAI_API_KEY = 'OPENAI_API_KEY',
+  OPENAI_MAX_TOKENS = 'OPENAI_MAX_TOKENS',
   OPENAI_BASE_PATH = 'OPENAI_BASE_PATH',
   description = 'description',
   emoji = 'emoji',
@@ -63,6 +64,16 @@ export const configValidators = {
     return value;
   },
 
+  [CONFIG_KEYS.OPENAI_MAX_TOKENS](value: any) {
+    validateConfig(
+      CONFIG_KEYS.OPENAI_MAX_TOKENS,
+      typeof value === 'number',
+      'Must be a number'
+    );
+
+    return value;
+  },
+
   [CONFIG_KEYS.emoji](value: any) {
     validateConfig(
       CONFIG_KEYS.emoji,