Update upgrade guide for https proxy setting (axios#3604)

Co-authored-by: Jay <[email protected]>
oskarunt · Dec 22, 2021 · 962f9ab · 962f9ab
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 # Upgrade Guide
 
+### 0.18.x -> 0.19.0
+
+#### HTTPS Proxies
+
+Routing through an https proxy now requires setting the `protocol` attribute of the proxy configuration to `https`
+
 ### 0.15.x -> 0.16.0
 
 #### `Promise` Type Declarations