Fix SDK version extraction (#55)

## Problem

While trying to add SDK version to user agent string, it fails.

## Solution

Hard coded the value into the user agent string.

## Type of Change

- [X] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [ ] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

## Test Plan

Ran integration tests locally.

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 [comment]: <> (When bumping [pc:VERSION_LATEST_RELEASE] create a new entry below)
 ### Unreleased version
+### v0.7.2
+- Fix extraction of SDK version
 
 ### v0.7.0
 - Add support to list indexes

README.md

@@ -15,20 +15,20 @@ Maven:
 <dependency>
   <groupId>io.pinecone</groupId>
   <artifactId>pinecone-client</artifactId>
-  <version>0.7.1</version>
+  <version>0.7.2</version>
 </dependency>
 ```
 
 [comment]: <> (^ [pc:VERSION_LATEST_RELEASE])
 
 Gradle:
 ```
-implementation "io.pinecone:pinecone-client:0.7.1"
+implementation "io.pinecone:pinecone-client:0.7.2"
 ```
 
 [comment]: <> (^ [pc:VERSION_LATEST_RELEASE])
 
-Alternatively, you can use our standalone uberjar [pinecone-client-0.7.1-all.jar](https://repo1.maven.org/maven2/io/pinecone/pinecone-client/0.7.1/pinecone-client-0.7.1-all.jar), which bundles the pinecone client and all dependencies together inside a single jar. You can include this on your classpath like any 3rd party JAR without having to obtain the *pinecone-client* dependencies separately.
+Alternatively, you can use our standalone uberjar [pinecone-client-0.7.2-all.jar](https://repo1.maven.org/maven2/io/pinecone/pinecone-client/0.7.2/pinecone-client-0.7.2-all.jar), which bundles the pinecone client and all dependencies together inside a single jar. You can include this on your classpath like any 3rd party JAR without having to obtain the *pinecone-client* dependencies separately.
 
 [comment]: <> (^ [pc:VERSION_LATEST_RELEASE])
 

gradle.properties

@@ -1 +1 @@
-pineconeClientVersion = 0.7.1
+pineconeClientVersion = 0.7.2

src/main/java/io/pinecone/PineconeClientConfig.java

@@ -139,18 +139,8 @@ private String maskedApiKey() {
     }
 
     public String getUserAgent() {
-        Properties properties = new Properties();
-        String userAgentLanguage = "lang=java";
-        String version = (this.getUsageContext() != null) ?
-                userAgentLanguage + "; usageContext=" + this.getUsageContext()
-                : userAgentLanguage;
-
-        try (FileInputStream input = new FileInputStream("gradle.properties")) {
-            properties.load(input);
-            version = properties.getProperty("pineconeClientVersion") + "; " + version;
-        } catch (IOException e) {
-            throw new PineconeException("Unable to extract pinecone client version");
-        }
-        return version;
+        String userAgentLanguage = "lang=java; pineconeClientVersion = v0.7.2";
+        return (this.getUsageContext() != null) ?
+                userAgentLanguage + "; usageContext=" + this.getUsageContext() : userAgentLanguage;
     }
 }