Add SDK telemetry headers (v0.5.1)

- Add X-Api-Client header: 'oilpriceapi-node'
- Add X-Client-Version header: '0.5.1'
- Update User-Agent to include Node.js version
- Remove deprecated X-SDK-Language, X-SDK-Version, X-Client-Type headers

Resolves: #12
Documentation: /home/kwaldman/code/sdks/EISENHOWER_MATRIX_PLAN.md

Author: karlwaldman

package.json

@@ -1,6 +1,6 @@
 {
   "name": "oilpriceapi",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Official Node.js SDK for Oil Price API - Real-time and historical oil & commodity prices",
   "type": "module",
   "main": "./dist/index.js",

src/client.ts

@@ -181,10 +181,9 @@ export class OilPriceAPI {
             headers: {
               'Authorization': `Bearer ${this.apiKey}`,
               'Content-Type': 'application/json',
-              'User-Agent': 'oilpriceapi-node/0.5.0',
-              'X-SDK-Language': 'javascript',
-              'X-SDK-Version': '0.5.0',
-              'X-Client-Type': 'sdk',
+              'User-Agent': 'oilpriceapi-node/0.5.1 node/' + process.version,
+              'X-Api-Client': 'oilpriceapi-node',
+              'X-Client-Version': '0.5.1',
             },
             signal: controller.signal,
           });