[typescript-angular] Update default Angular version from 4.3 to 7.0

Created by: karismann

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh, ./bin/security/{LANG}-petstore.sh and ./bin/openapi3/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• Filed the PR against the correct branch: master, 3.4.x, 4.0.x. Default: master.
• Copied the technical committee to review the pull request if your PR is targeting a particular programming language. @TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @nicokoenig (2018/09) @topce (2018/10)

Description of the PR

update the default Angular version from 4.3 to 6.0 for generate client with npm libraries issue #2116 (closed)

useful link : https://angular.io/guide/releases#support-policy-and-schedule

docs/generators/typescript-angular.md

@@ -20,7 +20,7 @@ sidebar_label: typescript-angular
 |withInterfaces|Setting this property to true will generate interfaces next to the default class implementations.| |false|
 |taggedUnions|Use discriminators to create tagged unions instead of extending interfaces.| |false|
 |providedInRoot|Use this property to provide Injectables in root (it is only valid in angular version greater or equal to 6.0.0).| |false|
-|ngVersion|The version of Angular. Default is '4.3'| |null|
+|ngVersion|The version of Angular. Default is '7.0.0'| |null|
 |serviceSuffix|The suffix of the generated service. Default is 'Service'.| |null|
 |serviceFileSuffix|The suffix of the file of the generated service (service<suffix>.ts). Default is '.service'.| |null|
 |modelSuffix|The suffix of the generated model. Default is ''.| |null|

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptAngularClientCodegen.java

@@ -93,7 +93,7 @@ public class TypeScriptAngularClientCodegen extends AbstractTypeScriptClientCode
         this.cliOptions.add(new CliOption(PROVIDED_IN_ROOT,
                 "Use this property to provide Injectables in root (it is only valid in angular version greater or equal to 6.0.0).",
                 SchemaTypeUtil.BOOLEAN_TYPE).defaultValue(Boolean.FALSE.toString()));
-        this.cliOptions.add(new CliOption(NG_VERSION, "The version of Angular. Default is '4.3'"));
+        this.cliOptions.add(new CliOption(NG_VERSION, "The version of Angular. Default is '7.0.0'"));
         this.cliOptions.add(new CliOption(SERVICE_SUFFIX, "The suffix of the generated service. Default is 'Service'."));
         this.cliOptions.add(new CliOption(SERVICE_FILE_SUFFIX, "The suffix of the file of the generated service (service<suffix>.ts). Default is '.service'."));
         this.cliOptions.add(new CliOption(MODEL_SUFFIX, "The suffix of the generated model. Default is ''."));
@@ -138,7 +138,7 @@ public class TypeScriptAngularClientCodegen extends AbstractTypeScriptClientCode
         if (additionalProperties.containsKey(NG_VERSION)) {
             ngVersion = new SemVer(additionalProperties.get(NG_VERSION).toString());
         } else {
-            ngVersion = new SemVer("4.3.0");
+            ngVersion = new SemVer("7.0.0");
             LOGGER.info("generating code for Angular {} ...", ngVersion);
             LOGGER.info("  (you can select the angular version by setting the additionalProperty ngVersion)");
         }