adding v1.1.2 upgrade info

docs/common/mainnet/002-upgrades.md

@@ -5,12 +5,28 @@ title: Mainnet upgrades
 
 # Mainnet upgrades
 
+## V1.1.2
+
+Core binary: (
+alpine-linux/amd64): "<https://github.com/rarimo/rarimo-core/releases/download/v1.1.2/rarimo-core-alpine-linux-amd64>".
+
+Also, you can build core from sources by yourself: use <"https://github.com/rarimo/rarimo-core/releases/tag/v1.1.2">
+release information.
+
+Also, if you are using Ubuntu linux, please install `musl-dev` using `sudo apt install musl-dev` command to be able to
+use Alpine binary on your machine.
+
+If you are using `cosmovisor` the upgrade will be done automatically.
+
+Upgrade v1.1.2 changes the parameters of [feemarket](../../../x/feemarket) module, in particular `BaseFee`
+and `NoBaseFee` that should be `0` and `true` while we are using zero commissions on production.
+
 ## V1.1.1
 
 Core binary: (
 alpine-linux/amd64): "<https://github.com/rarimo/rarimo-core/releases/download/v1.1.1/rarimo-core-alpine-linux-amd64>".
 
-Also, you can build core from sources by yourself: use <"https://github.com/rarimo/rarimo-core/releases/tag/v1.1.1">
+Also, you can build core from sources by yourself: use <"https://github.com/rarimo/rarimo-core/releases/tag/v1.1.1>"
 release information.
 
 Also, if you are using Ubuntu linux, please install `musl-dev` using `sudo apt install musl-dev` command to be able to