Apex generator = "currency" is also a reserved word

Description

Hello,

swagger-codegen is a great tool.

I have used "currency" as a property name and it is not detected as a reserved word (neither present in this official list: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_reserved_words.htm )

Swagger-codegen version

2.4.5

Swagger declaration file content or url

"Price": {
"type": "object",
"properties": {
"totalPrice": { "type": "number" },
"currency": {"type": "string" }
}
},

Command line used for generation

java -jar swagger-codegen-cli-2.4.5.jar generate -i source/swagger.json -l apex -o c:\swagger\generated

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

"currency" is not in the list of reserved words for apex:

https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/ApexClientCodegen.java

Best regards

Start in modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/ApexClientCodegen.java and inspect the Apex reserved-word handling for generated properties. Reproduce with the provided Swagger declaration and Java CLI command, then verify that a property named "currency" is handled correctly in the generated Apex output.