Update README.md and golangci-lint workflow (#41)

* Update README.md

* Update linter workflow

.github/workflows/golangci-lint.yml

@@ -11,18 +11,12 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.17
+      - uses: actions/checkout@v3
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3
         with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.29
-
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true
+          # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
+          version: latest

README.md

@@ -42,11 +42,11 @@ trusted party has claimed the scope name in the public repositories.
 ## Usage
 ```
 Usage:
- ./confused [-l LANGUAGENAME] depfilename.ext
+ confused [-l LANGUAGENAME] depfilename.ext
 
-Usage of ./confused:
+Usage of confused:
   -l string
-        Package repository system. Possible values: "pip", "npm", "composer", "mvn" (default "npm")
+        Package repository system. Possible values: "pip", "npm", "composer", "mvn", "rubygems" (default "npm")
   -s string
         Comma-separated list of known-secure namespaces. Supports wildcards
   -v    Verbose output
@@ -80,7 +80,6 @@ Issues found, the following packages are not available in public package reposit
  [!] internal_package1
 ```
 
-
 ### Maven (mvn)
 ```
 ./confused -l mvn pom.xml
@@ -91,3 +90,14 @@ Issues found, the following packages are not available in public package reposit
  [!] internal/_package2
 
 ```
+
+### Ruby (rubygems)
+```
+./confused -l rubygems Gemfile.lock
+
+Issues found, the following packages are not available in public package repositories:
+ [!] internal
+ [!] internal/package1
+ [!] internal/_package2
+ 
+```