dnf/yum update is the same as dnf upgrade -- it updates all packages (#1184)

No reason to run it before installing or upgrading httpie.
This is not apt.

docs/README.md

@@ -190,13 +190,11 @@ $ apt upgrade httpie
 
 ```bash
 # Install httpie
-$ dnf update
 $ dnf install httpie
 ```
 
 ```bash
 # Upgrade httpie
-$ dnf update
 $ dnf upgrade httpie
 ```
 
@@ -206,14 +204,12 @@ Also works for other RHEL-derived distributions like ClearOS, Oracle Linux, etc.
 
 ```bash
 # Install httpie
-$ yum update
 $ yum install epel-release
 $ yum install httpie
 ```
 
 ```bash
 # Upgrade httpie
-$ yum update
 $ yum upgrade httpie
 ```
 

docs/installation/methods.yml

@@ -112,10 +112,8 @@ tools:
       package: https://src.fedoraproject.org/rpms/httpie
     commands:
       install:
-        - dnf update
         - dnf install httpie
       upgrade:
-        - dnf update
         - dnf upgrade httpie
 
   emerge:
@@ -247,9 +245,7 @@ tools:
       package: https://src.fedoraproject.org/rpms/httpie
     commands:
       install:
-        - yum update
         - yum install epel-release
         - yum install httpie
       upgrade:
-        - yum update
         - yum upgrade httpie