feat(readme): Update installation instructions (#134)

* update installation in readme

Author: hubertdeng123

README.md

@@ -8,15 +8,13 @@ A standalone cli tool used to manage dependencies for services. It simplifies th
 
 ## Installation
 
-A system-wide installation can be done by downloading the binary of the latest release
+The recommended way to install devservices is through a virtualenv in the requirements.txt.
 
 ```
-PLATFORM=darwin # Options: darwin/linux
-INSTALL_DIR="$HOME/.local/bin"
-curl -L "https://github.com/getsentry/devservices/releases/download/0.0.5/devservices-$PLATFORM" -o "$INSTALL_DIR/devservices"
-chmod +x "$INSTALL_DIR/devservices"
+devservices==0.0.5
 ```
 
+
 ## Usage
 
 devservices provides several commands to manage your services:

scripts/bump-version.sh

@@ -15,4 +15,3 @@ function replace() {
 
 replace "version = \"$OLD_VERSION\"" "version = \"$NEW_VERSION\"" pyproject.toml
 replace "devservices==$OLD_VERSION" "devservices==$NEW_VERSION" README.md
-replace "devservices\/releases\/download\/$OLD_VERSION\/" "devservices\/releases\/download\/$NEW_VERSION\/" README.md