Update documentation links (pointfreeco#3397)

Author: kgrigsby59

README.md

@@ -530,13 +530,14 @@ advanced usages.
 The documentation for releases and `main` are available here:
 
 * [`main`](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/)
-* [1.14.0](https://pointfreeco.github.io/swift-composable-architecture/1.14.0/documentation/composablearchitecture/) ([migration guide](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/migratingto1.14))
+* [1.15.0](https://pointfreeco.github.io/swift-composable-architecture/1.15.0/documentation/composablearchitecture/) ([migration guide](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/migratingto1.15))
 
 <details>
   <summary>
   Other versions
   </summary>
 
+  * [1.14.0](https://pointfreeco.github.io/swift-composable-architecture/1.14.0/documentation/composablearchitecture/) ([migration guide](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/migratingto1.14))
   * [1.13.0](https://pointfreeco.github.io/swift-composable-architecture/1.13.0/documentation/composablearchitecture/) ([migration guide](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/migratingto1.13))
   * [1.12.0](https://pointfreeco.github.io/swift-composable-architecture/1.12.0/documentation/composablearchitecture/) ([migration guide](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/migratingto1.12))
   * [1.11.0](https://pointfreeco.github.io/swift-composable-architecture/1.11.0/documentation/composablearchitecture/) ([migration guide](https://pointfreeco.github.io/swift-composable-architecture/main/documentation/composablearchitecture/migratingto1.11))