title: How to create requirement.txt without all package versions
body: <p>Right now my <code>requirement.txt</code> contains following package list: </p>
  
  <pre><code>asgiref==3.2.3
  beautifulsoup4==4.8.2
  certifi==2019.11.28
  chardet==3.0.4
  Click==7.0
  Django==3.0.2
  idna==2.8
  pytz==2019.3
  requests==2.22.0
  six==1.14.0
  soupsieve==1.9.5
  sqlparse==0.3.0
  urllib3==1.25.7
  
  </code></pre>
  
  <p>I just want the package name only, so that pip3 always installs the latest version.</p>