feat: Use make2help

Makefile

@@ -1,14 +1,22 @@
-.DEFAULT: lint
 RELEASE_BRANCH := release/v1.0.x
 
+.DEFAULT_GOAL := help
+
+help:
+	@make2help $(MAKEFILE_LIST)
+
+
+## Run golangci-lint
 lint:
 	@golangci-lint run --enable-all --exclude-use-default=false -c=./.golangci.yml .
 
+## Checkout master branch & git log --oneline
 master:
 	@git branch -D master
 	@git fetch && git checkout -b master origin/master
 	@git log --oneline
 
+## Checkout new release branch.
 release:
 	@git branch -D ${RELEASE_BRANCH}
 	@git fetch && git checkout -b ${RELEASE_BRANCH} origin/${RELEASE_BRANCH}

README.md

@@ -1,6 +1,6 @@
 # EnvDef
 
-envdef provides methods of setting environment value with default value
+envdef provides methods of setting environment value with default value.
 
 ## Installation
 
@@ -18,14 +18,14 @@ go get github.com/locona/envdef/cmd/envdef
 
 ## Usage
 
-Add your application configuration to your .env file in the root of your project:
+Add your application configuration to your `.env` file in the root of your project:
 
 ```
 S3_BUCKET=YOURS3BUCKET
 SECRET_KEY=YOURSECRETKEYGOESHERE
 ```
 
-and .env.sample file in the root of your project:
+and `.env.sample` file in the root of your project:
 
 ```
 S3_BUCKET=YOURS3BUCKET
@@ -38,7 +38,7 @@ And then run:
 envdef
 ```
 
-As a result created the .env.new file
+As a result created the `.env.new` file
 
 ```
 REGION=REGION