title: How to upgrade angular version from 7 to 8?
body: <p>Running <code>ng update @angular/cli @angular/core</code> I would get this every time</p>
  
  <blockquote>
    <p>Package "@angular/compiler-cli" has an incompatible peer dependency
    to "@angular/compiler" (requires "8.2.0-next.1", would install
    "8.1.1")   Package "ag-grid-angular" has an incompatible peer
    dependency to "@angular/compiler-cli" (requires ">=2.1.x" (extended),
    would install "8.2.0-next.1").</p>
    
    <p>Package "angular-calendar" has an incompatible peer dependency to
    "@angular/core" (requires ">=5.0.0 &lt;7.0.0" (extended), would install
    "8.1.1").</p>
    
    <p>Package "@angular/compiler-cli" has an incompatible peer dependency
    to "@angular/compiler" (requires "8.2.0-next.1" (extended), would
    install "8.1.1").</p>
    
    <p>Package "angular-calendar" has an incompatible peer dependency to
    "@angular/common" (requires ">=5.0.0 &lt;7.0.0" (extended), would install
    "8.1.1").</p>
    
    <p>Package "angular-calendar" has an incompatible peer dependency to
    "@angular/animations" (requires ">=5.0.0 &lt;7.0.0" (extended), would
    install "8.1.1").</p>
  </blockquote>
  
  <p>My Environment now is :</p>
  
  <pre><code>Angular CLI: 7.3.9
  Node: 12.6.0
  OS: win32 x64
  Angular: 7.1.4
  ... common, compiler, compiler-cli, core, forms, http
  ... language-service, platform-browser, platform-browser-dynamic
  ... platform-server, router
  
  Package                            Version
  ------------------------------------------------------------
  @angular-devkit/architect          0.12.4
  @angular-devkit/build-angular      0.12.4
  @angular-devkit/build-optimizer    0.12.4
  @angular-devkit/build-webpack      0.12.4
  @angular-devkit/core               7.2.4
  @angular-devkit/schematics         7.3.9
  @angular/animations                7.2.15
  @angular/cdk                       7.3.7
  @angular/cli                       7.3.9
  @angular/material                  7.2.0
  @angular/material-moment-adapter   7.3.7
  @ngtools/webpack                   7.2.4
  @schematics/angular                7.3.9
  @schematics/update                 0.13.9
  rxjs                               6.5.2
  typescript                         3.4.5
  webpack                            4.28.4
  </code></pre>